---
id: CVE-2026-5435
title: Potential buffer overflow in ns_sprintrrf TSIG handling path
summary: >-
  The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C
  Library version 2.2 and newer fail to enforce the caller-supplied buffer
  length, and can result in an out-of-bounds write when printing TSIG records.
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'
cvssSource: adp
cwe:
  - CWE-787
vendor: The GNU C Library
product: glibc
affected:
  - glibc >= 2.2 <= *
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-04-28T15:15:07.411547Z'
published: '2026-04-28'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:12:12.018Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-5435'
references:
  - url: 'https://sourceware.org/bugzilla/show_bug.cgi?id=34033'
  - url: >-
      https://inbox.sourceware.org/libc-announce/7a655d55-276f-41fe-b550-feb3ebb2ce91@redhat.com/T/#u
tags:
  - cve.org
epss: 0.00394
epssPercentile: 0.3192
ingestedAt: '2026-10-15T05:52:46.049Z'
---

## Overview

The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail to enforce the caller-supplied buffer length, and can result in an out-of-bounds write when printing TSIG records.

## Affected

- `glibc >= 2.2 <= *`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.