CVE-2026-113351: high-severity vulnerability in libexpat
libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset
Published
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.2epss 0.5%
exploitation probability
0.5%top 59% of all CVEs
observed exploitation
nono source reports it
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:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
libexpat · libexpatRelated CVEs — libexpat
In the same product, most dangerous first.
CVE-2026-115506HIGHlibexpat through 2.9.0 Denial of Service via Billion Laughs Detection DelayEPSS 0.5%CVE-2026-118370HIGHlibexpat through 2.9.0 Integer Overflow in storeAtts via attIndex and nPrefixesEPSS 0.4%CVE-2026-117610HIGHlibexpat through 2.9.0 NULL Pointer Dereference via External Entity SubparserEPSS 0.4%CVE-2026-93990HIGHExpat before 2.8.5 Malformed UTF-16 Acceptance via Unchecked SurrogateEPSS 0.4%CVE-2026-102633HIGHlibexpat 2.7.2 through 2.8.5 Integer Overflow in expat_reallocEPSS 0.4%CVE-2026-76641HIGHExpat Out-of-Bounds Read via dtdCopyEPSS 0.4%
References
https://github.com/libexpat/libexpathttps://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L1560https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L860-L884https://github.com/libexpat/libexpat/pull/1431https://www.vulncheck.com/advisories/libexpat-2.7.2-through-2.9.0-denial-of-service-via-xml-parserreset