CVE-2026-77214 libexpat - Out of Bounds Read

libexpat before commit 13c5f63 contains a heap buffer over-read caused by improper validation of caller-supplied length in XML_ParseBuffer, letting attackers read out-of-bounds heap memory, exploit requires prior buffer allocation.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.55% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Read
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Published
7 October 2026
Updated
15 October 2026
Weakness
CWE-125

Vendor fix

Update to the version after commit 13c5f63 or latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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