CVE-2026-113351 PUBLISHED

libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset

Assigner: VulnCheck
Reserved: 20.10.2026 Published: 20.10.2026 Updated: 20.10.2026

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.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 5.9

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	libexpat
Product	libexpat
Versions	Default: unaffected affected from 2.7.2 to 2.9.0 (incl.)

CVE-2026-113351 PUBLISHED

libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset

Metrics

Product Status

Credits

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Problem Types