Vulnerability-Lookup

UBUNTU-CVE-2026-77781 (CVE-2026-77781)

Vulnerability from osv_ubuntu – Published: 2026-08-22 00:16 – Updated: 2026-09-02 16:27 – Source website

Details

Tie::Hash::Regex versions before 2.0.0 for Perl will throw an exception on unparseable lookup keys. The FETCH, EXISTS and DELETE methods throw an exception when on malformed regular expressions. Each method falls back to a regex match when the key is not already stored in the hash, compiling the caller's key with a bare qr// and no eval guard. A key that is not a valid regular expression pattern, such as a single unmatched bracket, dies. An application that looks up externally supplied strings in a tied hash will die on an invalid key.

Severity

7.5 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-77781	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-77781	REPORT
	https://lists.security.metacpan.org/cve-announce/…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtie-hash-regex-perl",
            "binary_version": "1.02-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "libtie-hash-regex-perl",
        "purl": "pkg:deb/ubuntu/libtie-hash-regex-perl@1.02-2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.02-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtie-hash-regex-perl",
            "binary_version": "1.02-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "libtie-hash-regex-perl",
        "purl": "pkg:deb/ubuntu/libtie-hash-regex-perl@1.02-2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.02-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtie-hash-regex-perl",
            "binary_version": "1.12-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libtie-hash-regex-perl",
        "purl": "pkg:deb/ubuntu/libtie-hash-regex-perl@1.12-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.12-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtie-hash-regex-perl",
            "binary_version": "1.14-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libtie-hash-regex-perl",
        "purl": "pkg:deb/ubuntu/libtie-hash-regex-perl@1.14-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.14-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtie-hash-regex-perl",
            "binary_version": "1.14-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libtie-hash-regex-perl",
        "purl": "pkg:deb/ubuntu/libtie-hash-regex-perl@1.14-2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.14-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtie-hash-regex-perl",
            "binary_version": "1.14-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libtie-hash-regex-perl",
        "purl": "pkg:deb/ubuntu/libtie-hash-regex-perl@1.14-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.14-2"
      ]
    }
  ],
  "aliases": [],
  "details": "Tie::Hash::Regex versions before 2.0.0 for Perl will throw an exception on unparseable lookup keys. The FETCH, EXISTS and DELETE methods throw an exception when on malformed regular expressions. Each method falls back to a regex match when the key is not already stored in the hash, compiling the caller\u0027s key with a bare qr// and no eval guard. A key that is not a valid regular expression pattern, such as a single unmatched bracket, dies. An application that looks up externally supplied strings in a tied hash will die on an invalid key.",
  "id": "UBUNTU-CVE-2026-77781",
  "modified": "2026-09-02T16:27:47Z",
  "published": "2026-08-22T00:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-77781"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-77781"
    },
    {
      "type": "REPORT",
      "url": "https://lists.security.metacpan.org/cve-announce/msg/42893692/"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-77781"
  ]
}

CVE-2026-77781 (GCVE-0-2026-77781)

Vulnerability from cvelistv5 – Published: 2026-08-21 23:57 – Updated: 2026-08-27 19:12

Title

Tie::Hash::Regex versions before 2.0.0 for Perl will throw an exception on unparseable lookup keys

Summary

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 2026-08-27 19:12 UTC

CWE

CWE-248 - Uncaught Exception

Assigner

CPANSec redhat root Scorecard

References

3 references

URL	Tags
https://metacpan.org/release/DAVECROSS/Tie-Hash-R…	release-notes
https://github.com/davorg-cpan/tie-hash-regex/com…	patch
http://www.openwall.com/lists/oss-security/2026/08/22/2

Impacted products

1 product

Vendor	Product	Version
		Affected: 0 , < 2.0.0 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-08-22T04:12:19.600Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/08/22/2"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-77781",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-27T19:12:36.613814Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-27T19:12:59.227Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "Tie::Hash::Regex"
          ],
          "packageName": "Tie-Hash-Regex",
          "packageURL": "pkg:cpan/Tie-Hash-Regex",
          "programFiles": [
            "lib/Tie/Hash/Regex.pm"
          ],
          "programRoutines": [
            {
              "name": "Tie::Hash::Regex::FETCH"
            },
            {
              "name": "Tie::Hash::Regex::EXISTS"
            },
            {
              "name": "Tie::Hash::Regex::DELETE"
            }
          ],
          "repo": "https://github.com/davorg-cpan/tie-hash-regex",
          "versions": [
            {
              "lessThan": "2.0.0",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Tie::Hash::Regex versions before 2.0.0 for Perl will throw an exception on unparseable lookup keys.\n\nThe FETCH, EXISTS and DELETE methods throw an exception when on malformed regular expressions.\n\nEach method falls back to a regex match when the key is not already stored in the hash, compiling the caller\u0027s key with a bare qr// and no eval guard. A key that is not a valid regular expression pattern, such as a single unmatched bracket, dies.\n\nAn application that looks up externally supplied strings in a tied hash will die on an invalid key."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-248",
              "description": "CWE-248 Uncaught Exception",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-21T23:57:02.918Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/DAVECROSS/Tie-Hash-Regex-2.0.0/source/Changes"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/davorg-cpan/tie-hash-regex/commit/4239732cb76233543e2ded8ff5e0f238af152e0c.patch"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to Tie::Hash::Regex version 2.0.0 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Tie::Hash::Regex versions before 2.0.0 for Perl will throw an exception on unparseable lookup keys",
      "workarounds": [
        {
          "lang": "en",
          "value": "For deployments that cannot be upgraded, ensure that calls to check the existence of keys, fetch values from keys or delete keys are wrapped in an eval block."
        }
      ],
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-77781",
    "datePublished": "2026-08-21T23:57:02.918Z",
    "dateReserved": "2026-08-21T11:41:39.920Z",
    "dateUpdated": "2026-08-27T19:12:59.227Z",
    "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.
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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.

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.
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UBUNTU-CVE-2026-77781 (CVE-2026-77781)

CVE-2026-77781 (GCVE-0-2026-77781)

Tags

Sightings

Nomenclature

Related by attack behaviour