CVE-2026-40469: fossies gawk Integer Overflow or Wraparound
CVSS: 9.1v3.1CriticalAnalyzed
AliasesUBUNTU-CVE-2026-40469DEBIAN-CVE-2026-40469
Published 13-07-2026Last modified 13-07-2026
Vulnerability summary
CVE-2026-40469 is a critical (CVSS 9.1) Integer Overflow or Wraparound vulnerability in fossies gawk. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 11% of scored vulnerabilities.
CVSS score
9.1/10
010
Critical · v3.1 (NVD)EPSS score
0.21%
0%100%
Low · -0.14 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 4 · Related 1Timeline
- 13-07-2026PublishedVulnerability first disclosed.
- 13-07-2026Last modifiedVulnerability information updated.
Description
Integer overflow vulnerability has been found in "builtin.c" program file of gawk (do_sub() routine). This issue could be used to overwrite gawk heap metadata and objects causing the program to crash. It affects 32-bit builds of gawk in versions 5.4.0 and below.
CVSS metrics
6 scores · 4 sources · 2 versionsMedium 5.1Preferred score · CVE.org (CNA)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated5.1MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- NVDNIST5.1MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Critical 9.1Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS trend
Probability
0.21%
Chance of exploitation in the next 30 days
Percentile
11%
Versus all other CVEs
30-day change
-0.14 pp
From 0.35% on 20-09-2026
20-09-202620-10-2026
EPSS score0.21%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- gawkAll versions (No fix recorded)
Fossies1 product
- gawk≤ 5.4.0
Gnu1 product
- gawk≤ 5.4.0
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
6 links- cert.pl/en/posts/2026/07/CVE-2026-40467Third Party Advisory
