CVE-2026-118370: fallo de gravedad alta en libexpat
libexpat through 2.9.0 Integer Overflow in storeAtts via attIndex and nPrefixes
Publicada el
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 8.2epss 0.4%
probabilidad de explotación
0.4%top 62% de las CVE
explotación observada
noninguna fuente lo reporta
libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Productos afectados
libexpat · libexpatCVEs relacionadas — libexpat
En el mismo producto, de las más peligrosas a las menos.
CVE-2026-113351HIGHlibexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserResetEPSS 0.5%CVE-2026-115506HIGHlibexpat through 2.9.0 Denial of Service via Billion Laughs Detection DelayEPSS 0.5%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%
Referencias
https://github.com/libexpat/libexpathttps://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L4138-L4140https://github.com/libexpat/libexpat/commit/1bac53c4fc460a03cd9860f39501c7979f6750aehttps://github.com/libexpat/libexpat/commit/621cb2c78b253ee023a86bc91d6ddb048481c04chttps://github.com/libexpat/libexpat/pull/1450https://www.vulncheck.com/advisories/libexpat-through-2.9.0-integer-overflow-in-storeatts-via-attindex-and-nprefixes