Vulnerability-Lookup

UBUNTU-CVE-2026-19542 (CVE-2026-19542)

Vulnerability from osv_ubuntu – Published: 2026-08-27 00:00 – Updated: 2026-09-16 11:31 – Source website

Details

Calling tdelete on a sufficiently deep tree in the GNU C Library version 2.1 to 2.44 may write one pointer past the end of an alloca-allocated array on the stack, which may crash the application. The tdelete implementation keeps an explicit stack of parent nodes for rebalancing, which is grown as needed while descending the tree. Two rebalancing branches push an additional entry without checking the capacity, and write past the array when the stack is exactly full. Triggering this requires a node at a depth of exactly 40 (or 40 plus a multiple of 20), which implies a tree with at least a million nodes, so an attacker must drive a large number of insertions and deletions through an application that uses tsearch and tdelete. The written value is a pointer into a tree node and is not directly attacker controlled. No affected application in common distributions has been identified.

Severity

5.6 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-19542	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-19542	REPORT
	https://ubuntu.com/security/notices/USN-8737-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8737-2	ADVISORY

JSON

To clipboard

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  ],
  "upstream": [
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}

CVE-2026-19542 (GCVE-0-2026-19542)

Vulnerability from cvelistv5 – Published: 2026-09-14 17:18 – Updated: 2026-09-14 19:42

Title

Stack-based out-of-bounds write in tdelete during tree rebalancing

Summary

Severity

5.6 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 19:41 UTC

CWE

CWE-121 - Stack-based buffer overflow

Assigner

glibc CNA under the redhat root

CNA scorecard B 76/100 over 14 records in the last 180 days details

References

2 references

URL	Tags
https://sourceware.org/bugzilla/show_bug.cgi?id=34506	issue-tracking
https://sourceware.org/git/?p=glibc.git;a=blob_pl…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
The GNU C Library	glibc	Affected: 2.1 , ≤ 2.44 (custom)

Date Public

2026-08-11 04:00

Credits

AISLE in partnership with Red Hat

Show details on NVD website

JSON

To clipboard

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USN-8737-1 (UBUNTU-CVE-2026-6368)

Vulnerability from osv_ubuntu – Published: 2026-09-08 15:17 – Updated: 2026-09-17 10:33 – Source website

Summary

glibc vulnerabilities

Details

It was discovered that GNU C Library had a buffer overflow in the strfmon function when handling right-justification padding. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-19499)

It was discovered that GNU C Library had an out-of-bounds stack array access in the tdelete function. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-19542)

It was discovered that GNU C Library incorrectly handled memory when calling wordexp with the WRDE_APPEND flag. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-6368)

It was discovered that GNU C Library had a stack overflow in the wordexp function when expanding paths beginning with a tilde followed by a long username. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-6791)

It was discovered that GNU C Library had a hang in the SHIFT_JISX0213 character set converter. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-77117)

It was discovered that GNU C Library had a hang in the EUC_JISX0213 character set converter. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-80489)

References

URL

Type

	https://ubuntu.com/security/notices/USN-8737-1	ADVISORY
	https://ubuntu.com/security/CVE-2026-6368	REPORT
	https://ubuntu.com/security/CVE-2026-6791	REPORT
	https://ubuntu.com/security/CVE-2026-19499	REPORT
	https://ubuntu.com/security/CVE-2026-19542	REPORT
	https://ubuntu.com/security/CVE-2026-77117	REPORT
	https://ubuntu.com/security/CVE-2026-80489	REPORT

JSON

To clipboard

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  "affected": [
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  ],
  "aliases": [],
  "details": "It was discovered that GNU C Library had a buffer overflow in the strfmon\nfunction when handling right-justification padding. An attacker could\npossibly use this issue to cause a denial of service or execute arbitrary\ncode. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-19499)\n\nIt was discovered that GNU C Library had an out-of-bounds stack array\naccess in the tdelete function. An attacker could possibly use this issue\nto cause a denial of service or execute arbitrary code. (CVE-2026-19542)\n\nIt was discovered that GNU C Library incorrectly handled memory when\ncalling wordexp with the WRDE_APPEND flag. An attacker could possibly use\nthis issue to cause a denial of service. (CVE-2026-6368)\n\nIt was discovered that GNU C Library had a stack overflow in the wordexp\nfunction when expanding paths beginning with a tilde followed by a long\nusername. An attacker could possibly use this issue to cause a denial of\nservice or execute arbitrary code. (CVE-2026-6791)\n\nIt was discovered that GNU C Library had a hang in the SHIFT_JISX0213\ncharacter set converter. An attacker could possibly use this issue to cause\na denial of service. (CVE-2026-77117)\n\nIt was discovered that GNU C Library had a hang in the EUC_JISX0213\ncharacter set converter. An attacker could possibly use this issue to cause\na denial of service. (CVE-2026-80489)",
  "id": "USN-8737-1",
  "modified": "2026-09-17T10:33:46Z",
  "published": "2026-09-08T15:17:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8737-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6368"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6791"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-19499"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-19542"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-77117"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-80489"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "glibc vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-6368",
    "UBUNTU-CVE-2026-6791",
    "UBUNTU-CVE-2026-19499",
    "UBUNTU-CVE-2026-19542",
    "UBUNTU-CVE-2026-77117",
    "UBUNTU-CVE-2026-80489"
  ]
}

USN-8737-2 (UBUNTU-CVE-2026-6368)

Vulnerability from osv_ubuntu – Published: 2026-09-10 11:25 – Updated: 2026-09-17 10:33 – Source website

Summary

glibc vulnerabilities

Details

USN-8737-1 fixed vulnerabilities in GNU C Library. This update provides the corresponding fixes for Ubuntu 24.04 LTS.

Original advisory details:

It was discovered that GNU C Library incorrectly handled memory when calling wordexp with the WRDE_APPEND flag. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-6368)

It was discovered that GNU C Library had a hang in the SHIFT_JISX0213 character set converter. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-77117)

It was discovered that GNU C Library had a hang in the EUC_JISX0213 character set converter. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-80489)

References

URL

Type

	https://ubuntu.com/security/notices/USN-8737-2	ADVISORY
	https://ubuntu.com/security/CVE-2026-6368	REPORT
	https://ubuntu.com/security/CVE-2026-6791	REPORT
	https://ubuntu.com/security/CVE-2026-19499	REPORT
	https://ubuntu.com/security/CVE-2026-19542	REPORT
	https://ubuntu.com/security/CVE-2026-77117	REPORT
	https://ubuntu.com/security/CVE-2026-80489	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-6368",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/S:P/AU:Y/U:Green",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-6791",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:L/SA:H/E:U",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-19499",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-19542",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-77117",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-80489",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "glibc-source",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc-bin",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc-dev-bin",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc-devtools",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc6",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc6-amd64",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc6-dev-amd64",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc6-dev-i386",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc6-dev-s390",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc6-dev-x32",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc6-i386",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc6-s390",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "libc6-x32",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "locales",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "locales-all",
            "binary_version": "2.39-0ubuntu8.9"
          },
          {
            "binary_name": "nscd",
            "binary_version": "2.39-0ubuntu8.9"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "glibc",
        "purl": "pkg:deb/ubuntu/glibc@2.39-0ubuntu8.9?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.39-0ubuntu8.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.38-1ubuntu6",
        "2.38-3ubuntu1",
        "2.39-0ubuntu1",
        "2.39-0ubuntu2",
        "2.39-0ubuntu6",
        "2.39-0ubuntu8",
        "2.39-0ubuntu8.1",
        "2.39-0ubuntu8.2",
        "2.39-0ubuntu8.3",
        "2.39-0ubuntu8.4",
        "2.39-0ubuntu8.5",
        "2.39-0ubuntu8.6",
        "2.39-0ubuntu8.7",
        "2.39-0ubuntu8.8"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-8737-1 fixed vulnerabilities in GNU C Library. This update provides\nthe corresponding fixes for Ubuntu 24.04 LTS.\n\nOriginal advisory details:\n\n It was discovered that GNU C Library had a buffer overflow in the strfmon\n function when handling right-justification padding. An attacker could\n possibly use this issue to cause a denial of service or execute arbitrary\n code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-19499)\n\n It was discovered that GNU C Library had an out-of-bounds stack array\n access in the tdelete function. An attacker could possibly use this issue\n to cause a denial of service or execute arbitrary code. (CVE-2026-19542)\n\n It was discovered that GNU C Library incorrectly handled memory when\n calling wordexp with the WRDE_APPEND flag. An attacker could possibly use\n this issue to cause a denial of service. (CVE-2026-6368)\n\n It was discovered that GNU C Library had a stack overflow in the wordexp\n function when expanding paths beginning with a tilde followed by a long\n username. An attacker could possibly use this issue to cause a denial of\n service or execute arbitrary code. (CVE-2026-6791)\n\n It was discovered that GNU C Library had a hang in the SHIFT_JISX0213\n character set converter. An attacker could possibly use this issue to cause\n a denial of service. (CVE-2026-77117)\n\n It was discovered that GNU C Library had a hang in the EUC_JISX0213\n character set converter. An attacker could possibly use this issue to cause\n a denial of service. (CVE-2026-80489)",
  "id": "USN-8737-2",
  "modified": "2026-09-17T10:33:46Z",
  "published": "2026-09-10T11:25:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8737-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6368"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6791"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-19499"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-19542"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-77117"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-80489"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "glibc vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-6368",
    "UBUNTU-CVE-2026-6791",
    "UBUNTU-CVE-2026-19499",
    "UBUNTU-CVE-2026-19542",
    "UBUNTU-CVE-2026-77117",
    "UBUNTU-CVE-2026-80489"
  ]
}

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

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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-2026-19542 (CVE-2026-19542)

CVE-2026-19542 (GCVE-0-2026-19542)

USN-8737-1 (UBUNTU-CVE-2026-6368)

USN-8737-2 (UBUNTU-CVE-2026-6368)

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