Ubuntu 26.04 LTS glibc Critical Denial of Service Issues USN-8737

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Several security issues were fixed in GNU C Library. Software Description: - glibc: GNU C Library 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 ... Read the Full Advisory

Several security issues were fixed in GNU C Library.

Software Description:

- glibc: GNU C Library

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 ...

The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS libc6 2.43-2ubuntu2.4 Ubuntu 22.04 LTS libc6 2.35-0ubuntu3.15 In general, a standard system update will make all the necessary changes.

CVE-2026-19499, CVE-2026-19542, CVE-2026-6368, CVE-2026-6791,

CVE-2026-77117, CVE-2026-80489

Ubuntu Security Notice USN-8737-1

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