7.5

CVE-2026-40467: fossies gawk Use After Free

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-40467DEBIAN-CVE-2026-40467
Published 13-07-2026Last modified 13-07-2026
Open JSON

Vulnerability summary

CVE-2026-40467 is a high (CVSS 7.5) Use After Free vulnerability in fossies gawk. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 11% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.21%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 12 · Related 6
MGASA-2026-0427OPENSUSE-SU-2026:21393-1RHSA-2026:40041RHSA-2026:49661RHSA-2026:73429RHSA-2026:73511

Timeline

  1. 13-07-2026
    PublishedVulnerability first disclosed.
  2. 13-07-2026
    Last modifiedVulnerability information updated.

Description

Use After Free vulnerability has been found in "io.c" program file of gawk (do_getline_redir() routine). This issue may lead to a crash. It affects gawk in versions 5.4.0 and below.

CVSS metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

11%

Versus all other CVEs

30-day change

0.00 pp

From 0.21% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.21%

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

Debian1 product
  • gawkAll versions (No fix recorded)
Fossies1 product
Gnu1 product
Ubuntu1 product
  • gawk< 1:4.0.1+dfsg-2.1ubuntu2+esm2 | < 1:4.1.3+dfsg-0.1ubuntu0.1~esm2 | < 1:4.1.4+dfsg-1ubuntu0.1~esm2 | < 1:5.0.1+dfsg-1ubuntu0.1+esm1 | < 1:5.1.0-1ubuntu0.2 | < 1:5.2.1-2ubuntu0.1 | < 1:5.3.2-1ubuntu1.1

4 vendors · 4 products

References

7 links