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Vulnerabilities

Vulnerability · CVE-2026-102633

libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes.

Published Sep 29, 2026 · catalog updated Oct 17, 2026 · libexpat versions 2.7.2 through

Check if you run it

No confirmed exploitation is on record for CVE-2026-102633. EPSS is 0.35%. Act only if a listed version of libexpat versions 2.7.2 through is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (libexpat versions 2.7.2 through).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.35%
Remediation
Advisory link
Affected products
Alpine:v3.24 expat · Debian:12 expat · Debian:13 expat · Debian:14 expat

libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Alpine:v3.24 expat0 → 2.9.0-r0
  • Debian:12 expat2.5.0-1, 2.5.0-1+deb12u1, 2.5.0-1+deb12u2
  • Debian:13 expat0 → 2.9.0-1~deb13u1
  • Debian:14 expat0 → 2.8.5-2

How to fix CVE-2026-102633

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-102633. EPSS is 0.35%. Act only if a listed version of libexpat versions 2.7.2 through is installed.

Which versions are affected?

Compare what you have installed with 0 → 2.9.0-r0, 2.5.0-1, 2.5.0-1+deb12u1, 2.5.0-1+deb12u2, 0 → 2.9.0-1~deb13u1, 0 → 2.8.5-2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.35%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 29, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service.

  2. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    expat fixed in 2.9.0-1~deb13u1; expat fixed in 2.8.5-2

  3. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    expat fixed in 2.9.0-1~deb13u1

  4. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    expat fixed in 2.8.5-2

  5. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service.

  6. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    expat fixed in 2.9.0-r0

  7. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    expat fixed in 2.9.0-r0

  8. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service.

Sources

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.