CVE-2026-118370: falha de alta gravidade em libexpat
libexpat through 2.9.0 Integer Overflow in storeAtts via attIndex and nPrefixes
Publicada em
21Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 8.2epss 0.4%
probabilidade de exploração
0.4%top 62% das CVEs
exploração observada
nãonenhuma fonte 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
Produtos afetados
libexpat · libexpatCVEs relacionadas — libexpat
No mesmo produto, das mais perigosas para as 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%
Referências
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