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Vulnerabilities

Vulnerability · CVE-2026-77214

libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c.

Published Oct 7, 2026 · catalog updated Oct 17, 2026 · libexpat before commit 13c5f63

Check if you run it

No confirmed exploitation is on record for CVE-2026-77214. EPSS is 0.55%. Act only if a listed version of libexpat before commit 13c5f63 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 before commit 13c5f63).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.55%
Remediation
Advisory link
Affected products
Alpine:v3.24 expat · Debian:12 expat · Debian:13 expat · Debian:14 expat

libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c. XML_ParseBuffer advances the parse buffer end with parser->m_bufferEnd += len using a caller-supplied length that is not validated against the allocated buffer size, so repeated XML_ParseBuffer calls move m_bufferEnd past the end of the heap allocation and subsequent parsing reads out of bounds. Reaching this path requires a parse buffer to already be present; otherwise XML_ParseBuffer returns XML_ERROR_NO_BUFFER. A buffer is present after a prior call to XML_GetBuffer, either directly (the common case) or indirectly through a prior XML_Parse call that allocates the buffer internally. The over-read discloses adjacent heap memory to the calling application, recovering heap pointers, libc function pointers, and code pointers sufficient to defeat ASLR and build further exploitation primitives.

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 → 2.9.0-1

How to fix CVE-2026-77214

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-2026-77214. EPSS is 0.55%. Act only if a listed version of libexpat before commit 13c5f63 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 → 2.9.0-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.55%. 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. Oct 7, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c. XML_ParseBuffer advances the parse buffer end with parser->m_bufferEnd += len using a caller-supplied length that is not validated against the allocated buffer size, so repeated XML_ParseBuffer calls move m_bufferEnd past the end of the heap allocation and subsequent parsing reads out of bounds. Reaching t

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

    Fix available

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

  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 2.9.0-1

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

    Updated

    libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c. XML_ParseBuffer advances the parse buffer end with parser->m_bufferEnd += len using a caller-supplied length that is not validated against the allocated buffer size, so repeated XML_ParseBuffer calls move m_bufferEnd past the end of the heap allocation and subsequent parsing reads out of bounds. Reaching t

  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 before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c. XML_ParseBuffer advances the parse buffer end with parser->m_bufferEnd += len using a caller-supplied length that is not validated against the allocated buffer size, so repeated XML_ParseBuffer calls move m_bufferEnd past the end of the heap allocation and subsequent parsing reads out of bounds. Reaching t

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.