libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations.

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:v3.21 expat0 → 2.10.0-r0
• Alpine:v3.22 expat0 → 2.10.0-r0
• Alpine:v3.23 expat0 → 2.10.0-r0
• Alpine:v3.24 expat0 → 2.10.0-r0
• Debian:12 expat2.5.0-1, 2.5.0-1+deb12u1, 2.5.0-1+deb12u2
• Debian:13 expat2.7.1-2, 2.7.2-1, 2.7.3-1
• Debian:14 expat2.7.1-2, 2.7.2-1, 2.7.3-1

How to fix CVE-2026-113351

• Upgrade

  CVE-2026-113351 lists a fix boundary at 2.10.0-r0. Compare the installed build with that boundary before you change production.

• Version check

  Fixed in 2.10.0-r0 · 9 other ranges on the advisory

• Advisory

  Open the cve_org record and follow its fix.

• Official advisories

  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • OpenSSF OSV / OSV Scanner · osv.dev
  • Trivy Vulnerability DB · osv.dev
  • Trivy Vulnerability DB · osv.dev

What to do

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

Technology hubs

Code

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

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Oct 20, 2026 · NIST NVD

   Detected

   libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.

2. Oct 20, 2026 · NIST NVD

   Updated

   libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.

3. Oct 20, 2026 · NIST NVD

   Updated

   libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.

4. Oct 23, 2026 · Trivy Vulnerability DB

   Updated

   libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.

5. Nov 4, 2026 · OpenSSF OSV / OSV Scanner

   Fix available

   expat fixed in 2.10.0-r0; expat fixed in 2.10.0-r0; expat fixed in 2.10.0-r0; expat fixed in 2.10.0-r0

6. Nov 4, 2026 · OpenSSF OSV / OSV Scanner

   Fix available

   expat fixed in 2.10.0-r0

7. Nov 4, 2026 · OpenSSF OSV / OSV Scanner

   Updated

   libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.

Sources

• CVE.orgVulnerability recordCVE-2026-113351

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-113351

  30-day exploitation probability 0.49%

  first.org
• NIST NVDVulnerability recordCVE-2026-113351

  libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_ME

  nvd.nist.gov
• OpenSSF OSV / OSV ScannerPackage advisoryALPINE-CVE-2026-113351
  osv.dev
• Trivy Vulnerability DBPackage advisoryALPINE-CVE-2026-113351

  libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_ME

  osv.dev
• Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-113351

  libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_ME

  osv.dev

References

• Reference · github.com
• Reference · github.com
• Reference · github.com
• Reference · github.com
• ADVISORY · security-tracker.debian.org
• ADVISORY · security.alpinelinux.org
• Reference · vulncheck.com

Freshness

Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

• Trivy Vulnerability DBNov 4, 2026
• OpenSSF OSV / OSV ScannerNov 4, 2026
• FIRST EPSSNov 4, 2026
• Trivy Vulnerability DBOct 23, 2026
• CVE.orgOct 21, 2026
• NIST NVDOct 21, 2026