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Findings

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 · updated Oct 16, 2026

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.

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 · OSV.dev

    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 · OSV.dev

    Fix available

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

  3. Oct 16, 2026 · OSV.dev

    Fix available

    expat fixed in 2.9.0-1~deb13u1

  4. Oct 16, 2026 · OSV.dev

    Fix available

    expat fixed in 2.8.5-2

  5. Oct 16, 2026 · OSV.dev

    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.

Affected

  • 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

Sources

References