5.5

CVE-2026-32778: libexpat_project libexpat NULL Pointer Dereference

CVSS: 5.5v3.1MediumModified
AliasesALPINE-CVE-2026-32778UBUNTU-CVE-2026-32778DEBIAN-CVE-2026-32778
Published 16-03-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-32778 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in libexpat_project libexpat. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.4% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.17%
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 18 · Related 17
MGASA-2026-0061MGASA-2026-0145OPENSUSE-SU-2026:10466-1OPENSUSE-SU-2026:10620-1OPENSUSE-SU-2026:10642-1OPENSUSE-SU-2026:20448-1

Timeline

  1. 16-03-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

libexpat before 2.7.5 allows a NULL pointer dereference in the function setContext on retry after an earlier ouf-of-memory condition.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

0.00 pp

From 0.17% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.17%

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

Ubuntu16 products
  • ayttmAll versions (No fix recorded)
  • cableswigAll versions (No fix recorded)
  • cadaverAll versions (No fix recorded)
  • coin3All versions (No fix recorded)
  • expat< 2.1.0-4ubuntu1.4+esm12 | < 2.1.0-7ubuntu0.16.04.5+esm13 | < 2.2.5-3ubuntu0.9+esm4 | < 2.2.9-1ubuntu0.8+esm2 | < 2.4.7-1ubuntu0.8 | < 2.6.1-2ubuntu0.5 | All versions (No fix recorded) | < 2.7.4-1ubuntu0.1
Alpine1 product
  • expat< 2.7.5-r0
Chainguard1 product
  • expat< 2.7.5-r0
Debian1 product
  • expat< 2.5.0-1+deb12u4 | < 2.8.2-1~deb13u1 | < 2.7.5-1
Libexpat_project1 product
Wolfi1 product
  • expat< 2.7.5-r0

6 vendors · 21 products

References

10 links