Vulnerability-Lookup

OPENSUSE-SU-2025:15832-1

Vulnerability from csaf_opensuse - Published: 2025-12-19 00:00 - Updated: 2026-09-20 21:46

Summary

coredns-for-k8s1.35-1.13.1-2.1 on GA media

Severity

Moderate

Notes

Title of the patch: coredns-for-k8s1.35-1.13.1-2.1 on GA media

Description of the patch: These are all security issues fixed in the coredns-for-k8s1.35-1.13.1-2.1 package on the GA media of openSUSE Tumbleweed.

Patchnames: openSUSE-Tumbleweed-2025-15832

CVE-2025-68156

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Recommended 8 products

Product	Version	Remediation
Unresolved product id: openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.x86_64	—	Vendor Fix

Threats

Impact important

References

5 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://www.suse.com/security/cve/CVE-2025-68156/	self
https://www.suse.com/security/cve/CVE-2025-68156	external
https://bugzilla.suse.com/1255330	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://www.suse.com/support/security/rating/",
      "text": "moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright 2024 SUSE LLC. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "coredns-for-k8s1.35-1.13.1-2.1 on GA media",
        "title": "Title of the patch"
      },
      {
        "category": "description",
        "text": "These are all security issues fixed in the coredns-for-k8s1.35-1.13.1-2.1 package on the GA media of openSUSE Tumbleweed.",
        "title": "Description of the patch"
      },
      {
        "category": "details",
        "text": "openSUSE-Tumbleweed-2025-15832",
        "title": "Patchnames"
      },
      {
        "category": "legal_disclaimer",
        "text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
        "title": "Terms of use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://www.suse.com/support/security/contact/",
      "name": "SUSE Product Security Team",
      "namespace": "https://www.suse.com/"
    },
    "references": [
      {
        "category": "external",
        "summary": "SUSE ratings",
        "url": "https://www.suse.com/support/security/rating/"
      },
      {
        "category": "self",
        "summary": "URL of this CSAF notice",
        "url": "https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2025_15832-1.json"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2025-68156 page",
        "url": "https://www.suse.com/security/cve/CVE-2025-68156/"
      }
    ],
    "title": "coredns-for-k8s1.35-1.13.1-2.1 on GA media",
    "tracking": {
      "current_release_date": "2026-09-20T21:46:47Z",
      "generator": {
        "date": "2025-12-19T00:00:00Z",
        "engine": {
          "name": "cve-database.git:bin/generate-csaf.pl",
          "version": "1"
        }
      },
      "id": "openSUSE-SU-2025:15832-1",
      "initial_release_date": "2025-12-19T00:00:00Z",
      "revision_history": [
        {
          "date": "2025-12-19T00:00:00Z",
          "number": "1",
          "summary": "Current version"
        },
        {
          "date": "2026-09-20T21:46:47Z",
          "number": "2",
          "summary": "unknown changes"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "coredns-for-k8s1.35-0:1.13.1-2.1.aarch64",
                "product": {
                  "name": "coredns-for-k8s1.35-0:1.13.1-2.1.aarch64",
                  "product_id": "coredns-for-k8s1.35-0:1.13.1-2.1.aarch64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/coredns-for-k8s1.35@1.13.1-2.1?arch=aarch64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.aarch64",
                "product": {
                  "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.aarch64",
                  "product_id": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.aarch64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/coredns-for-k8s1.35-extras@1.13.1-2.1?arch=aarch64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "aarch64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "coredns-for-k8s1.35-0:1.13.1-2.1.ppc64le",
                "product": {
                  "name": "coredns-for-k8s1.35-0:1.13.1-2.1.ppc64le",
                  "product_id": "coredns-for-k8s1.35-0:1.13.1-2.1.ppc64le",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/coredns-for-k8s1.35@1.13.1-2.1?arch=ppc64le"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.ppc64le",
                "product": {
                  "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.ppc64le",
                  "product_id": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.ppc64le",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/coredns-for-k8s1.35-extras@1.13.1-2.1?arch=ppc64le"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "ppc64le"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "coredns-for-k8s1.35-0:1.13.1-2.1.s390x",
                "product": {
                  "name": "coredns-for-k8s1.35-0:1.13.1-2.1.s390x",
                  "product_id": "coredns-for-k8s1.35-0:1.13.1-2.1.s390x",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/coredns-for-k8s1.35@1.13.1-2.1?arch=s390x"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.s390x",
                "product": {
                  "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.s390x",
                  "product_id": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.s390x",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/coredns-for-k8s1.35-extras@1.13.1-2.1?arch=s390x"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "s390x"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "coredns-for-k8s1.35-0:1.13.1-2.1.x86_64",
                "product": {
                  "name": "coredns-for-k8s1.35-0:1.13.1-2.1.x86_64",
                  "product_id": "coredns-for-k8s1.35-0:1.13.1-2.1.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/coredns-for-k8s1.35@1.13.1-2.1?arch=x86_64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.x86_64",
                "product": {
                  "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.x86_64",
                  "product_id": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/coredns-for-k8s1.35-extras@1.13.1-2.1?arch=x86_64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          },
          {
            "branches": [
              {
                "category": "product_name",
                "name": "openSUSE Tumbleweed",
                "product": {
                  "name": "openSUSE Tumbleweed",
                  "product_id": "openSUSE Tumbleweed",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:opensuse:tumbleweed"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "SUSE Linux Enterprise"
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "coredns-for-k8s1.35-0:1.13.1-2.1.aarch64 as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.aarch64"
        },
        "product_reference": "coredns-for-k8s1.35-0:1.13.1-2.1.aarch64",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "coredns-for-k8s1.35-0:1.13.1-2.1.ppc64le as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.ppc64le"
        },
        "product_reference": "coredns-for-k8s1.35-0:1.13.1-2.1.ppc64le",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "coredns-for-k8s1.35-0:1.13.1-2.1.s390x as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.s390x"
        },
        "product_reference": "coredns-for-k8s1.35-0:1.13.1-2.1.s390x",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "coredns-for-k8s1.35-0:1.13.1-2.1.x86_64 as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.x86_64"
        },
        "product_reference": "coredns-for-k8s1.35-0:1.13.1-2.1.x86_64",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.aarch64 as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.aarch64"
        },
        "product_reference": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.aarch64",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.ppc64le as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.ppc64le"
        },
        "product_reference": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.ppc64le",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.s390x as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.s390x"
        },
        "product_reference": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.s390x",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.x86_64 as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.x86_64"
        },
        "product_reference": "coredns-for-k8s1.35-extras-0:1.13.1-2.1.x86_64",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-68156",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2025-68156"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "Expr is an expression language and expression evaluation for Go. Prior to version 1.17.7, several builtin functions in Expr, including `flatten`, `min`, `max`, `mean`, and `median`, perform recursive traversal over user-provided data structures without enforcing a maximum recursion depth. If the evaluation environment contains deeply nested or cyclic data structures, these functions may recurse indefinitely until exceed the Go runtime stack limit. This results in a stack overflow panic, causing the host application to crash. While exploitability depends on whether an attacker can influence or inject cyclic or pathologically deep data into the\nevaluation environment, this behavior represents a denial-of-service (DoS) risk and affects overall library robustness. Instead of returning a recoverable evaluation error, the process may terminate unexpectedly. In affected versions, evaluation of expressions that invoke certain builtin functions on untrusted or insufficiently validated data structures can lead to a process-level crash due to stack exhaustion. This issue is most relevant in scenarios where Expr is used to evaluate expressions against externally supplied or dynamically constructed environments; cyclic references (directly or indirectly) can be introduced into arrays, maps, or structs; and there are no application-level safeguards preventing deeply nested input data. In typical use cases with controlled, acyclic data, the issue may not manifest. However, when present, the resulting panic can be used to reliably crash the application, constituting a denial of service. The issue has been fixed in the v1.17.7 versions of Expr. The patch introduces a maximum recursion depth limit for affected builtin functions. When this limit is exceeded, evaluation aborts gracefully and returns a descriptive error instead of panicking. Additionally, the maximum depth can be customized by users via `builtin.MaxDepth`, allowing applications with legitimate deep structures to raise the limit in a controlled manner. Users are strongly encouraged to upgrade to the patched release, which includes both the recursion guard and comprehensive test coverage to prevent regressions. For users who cannot immediately upgrade, some mitigations are recommended. Ensure that evaluation environments cannot contain cyclic references, validate or sanitize externally supplied data structures before passing them to Expr, and/or wrap expression evaluation with panic recovery to prevent a full process crash (as a last-resort defensive measure). These workarounds reduce risk but do not fully eliminate the issue without the patch.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.aarch64",
          "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.ppc64le",
          "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.s390x",
          "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.x86_64",
          "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.aarch64",
          "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.ppc64le",
          "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.s390x",
          "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2025-68156",
          "url": "https://www.suse.com/security/cve/CVE-2025-68156"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1255330 for CVE-2025-68156",
          "url": "https://bugzilla.suse.com/1255330"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.aarch64",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.ppc64le",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.s390x",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.x86_64",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.aarch64",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.ppc64le",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.s390x",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.aarch64",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.ppc64le",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.s390x",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-0:1.13.1-2.1.x86_64",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.aarch64",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.ppc64le",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.s390x",
            "openSUSE Tumbleweed:coredns-for-k8s1.35-extras-0:1.13.1-2.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2025-12-19T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2025-68156"
    }
  ]
}

CVE-2025-68156 (GCVE-0-2025-68156)

Vulnerability from cvelistv5 – Published: 2025-12-16 18:24 – Updated: 2025-12-16 19:59

Title

Expr has Denial of Service via Unbounded Recursion in Builtin Functions

Summary

Expr is an expression language and expression evaluation for Go. Prior to version 1.17.7, several builtin functions in Expr, including `flatten`, `min`, `max`, `mean`, and `median`, perform recursive traversal over user-provided data structures without enforcing a maximum recursion depth. If the evaluation environment contains deeply nested or cyclic data structures, these functions may recurse indefinitely until exceed the Go runtime stack limit. This results in a stack overflow panic, causing the host application to crash. While exploitability depends on whether an attacker can influence or inject cyclic or pathologically deep data into the evaluation environment, this behavior represents a denial-of-service (DoS) risk and affects overall library robustness. Instead of returning a recoverable evaluation error, the process may terminate unexpectedly. In affected versions, evaluation of expressions that invoke certain builtin functions on untrusted or insufficiently validated data structures can lead to a process-level crash due to stack exhaustion. This issue is most relevant in scenarios where Expr is used to evaluate expressions against externally supplied or dynamically constructed environments; cyclic references (directly or indirectly) can be introduced into arrays, maps, or structs; and there are no application-level safeguards preventing deeply nested input data. In typical use cases with controlled, acyclic data, the issue may not manifest. However, when present, the resulting panic can be used to reliably crash the application, constituting a denial of service. The issue has been fixed in the v1.17.7 versions of Expr. The patch introduces a maximum recursion depth limit for affected builtin functions. When this limit is exceeded, evaluation aborts gracefully and returns a descriptive error instead of panicking. Additionally, the maximum depth can be customized by users via `builtin.MaxDepth`, allowing applications with legitimate deep structures to raise the limit in a controlled manner. Users are strongly encouraged to upgrade to the patched release, which includes both the recursion guard and comprehensive test coverage to prevent regressions. For users who cannot immediately upgrade, some mitigations are recommended. Ensure that evaluation environments cannot contain cyclic references, validate or sanitize externally supplied data structures before passing them to Expr, and/or wrap expression evaluation with panic recovery to prevent a full process crash (as a last-resort defensive measure). These workarounds reduce risk but do not fully eliminate the issue without the patch.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-16 19:58 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7868 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/expr-lang/expr/security/adviso…	x_refsource_CONFIRM
https://github.com/expr-lang/expr/pull/870	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
expr-lang	expr	Affected: < 1.17.7

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-68156",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-16T19:58:48.969218Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-12-16T19:59:24.007Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "expr",
          "vendor": "expr-lang",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.17.7"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Expr is an expression language and expression evaluation for Go. Prior to version 1.17.7, several builtin functions in Expr, including `flatten`, `min`, `max`, `mean`, and `median`, perform recursive traversal over user-provided data structures without enforcing a maximum recursion depth. If the evaluation environment contains deeply nested or cyclic data structures, these functions may recurse indefinitely until exceed the Go runtime stack limit. This results in a stack overflow panic, causing the host application to crash. While exploitability depends on whether an attacker can influence or inject cyclic or pathologically deep data into the\nevaluation environment, this behavior represents a denial-of-service (DoS) risk and affects overall library robustness. Instead of returning a recoverable evaluation error, the process may terminate unexpectedly. In affected versions, evaluation of expressions that invoke certain builtin functions on untrusted or insufficiently validated data structures can lead to a process-level crash due to stack exhaustion. This issue is most relevant in scenarios where Expr is used to evaluate expressions against externally supplied or dynamically constructed environments; cyclic references (directly or indirectly) can be introduced into arrays, maps, or structs; and there are no application-level safeguards preventing deeply nested input data. In typical use cases with controlled, acyclic data, the issue may not manifest. However, when present, the resulting panic can be used to reliably crash the application, constituting a denial of service. The issue has been fixed in the v1.17.7 versions of Expr. The patch introduces a maximum recursion depth limit for affected builtin functions. When this limit is exceeded, evaluation aborts gracefully and returns a descriptive error instead of panicking. Additionally, the maximum depth can be customized by users via `builtin.MaxDepth`, allowing applications with legitimate deep structures to raise the limit in a controlled manner. Users are strongly encouraged to upgrade to the patched release, which includes both the recursion guard and comprehensive test coverage to prevent regressions. For users who cannot immediately upgrade, some mitigations are recommended. Ensure that evaluation environments cannot contain cyclic references, validate or sanitize externally supplied data structures before passing them to Expr, and/or wrap expression evaluation with panic recovery to prevent a full process crash (as a last-resort defensive measure). These workarounds reduce risk but do not fully eliminate the issue without the patch."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T18:24:11.648Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/expr-lang/expr/security/advisories/GHSA-cfpf-hrx2-8rv6",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/expr-lang/expr/security/advisories/GHSA-cfpf-hrx2-8rv6"
        },
        {
          "name": "https://github.com/expr-lang/expr/pull/870",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/expr-lang/expr/pull/870"
        }
      ],
      "source": {
        "advisory": "GHSA-cfpf-hrx2-8rv6",
        "discovery": "UNKNOWN"
      },
      "title": "Expr has Denial of Service via Unbounded Recursion in Builtin Functions"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-68156",
    "datePublished": "2025-12-16T18:24:11.648Z",
    "dateReserved": "2025-12-15T23:02:17.604Z",
    "dateUpdated": "2025-12-16T19:59:24.007Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted