7.3

CVE-2026-5435: gnu glibc Out-of-bounds Write

CVSS: 7.3v3.1HighModified
AliasesUBUNTU-CVE-2026-5435DEBIAN-CVE-2026-5435CGA-22q2-7v59-q4w8
Published 28-04-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-5435 is a high (CVSS 7.3) Out-of-bounds Write vulnerability in gnu glibc. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 32.1% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.39%
0%100%
Low · +0.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 10
MGASA-2026-0391OPENSUSE-SU-2026:11140-1OPENSUSE-SU-2026:21228-1RHSA-2026:12740RHSA-2026:42694RHSA-2026:42733

Timeline

  1. 28-04-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.39%

Chance of exploitation in the next 30 days

Percentile

32%

Versus all other CVEs

30-day change

+0.16 pp

From 0.24% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.39%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard53 products
  • glibcAll versions (No fix recorded)
  • glibc-2.43All versions (No fix recorded)
  • glibc-2.43-abi-reportAll versions (No fix recorded)
  • glibc-2.43-devAll versions (No fix recorded)
  • glibc-2.43-iconvAll versions (No fix recorded)
Wolfi53 products
  • glibcAll versions (No fix recorded)
  • glibc-2.43All versions (No fix recorded)
  • glibc-2.43-abi-reportAll versions (No fix recorded)
  • glibc-2.43-devAll versions (No fix recorded)
  • glibc-2.43-iconvAll versions (No fix recorded)
Ubuntu2 products
  • eglibcAll versions (No fix recorded)
  • glibcAll versions (No fix recorded) | < 2.35-0ubuntu3.14 | < 2.39-0ubuntu8.8 | < 2.43-2ubuntu2.3
Debian1 product
  • glibcAll versions (No fix recorded) | < 2.43-3
Gnu1 product
  • glibc≥ 2.2 (No fix recorded)
The gnu c library1 product
  • glibc≥ 2.2 (No fix recorded)

6 vendors · 111 products

References

9 links