CVE-2026-118370Published

libexpat through 2.9.0 Integer Overflow in storeAtts via attIndex and nPrefixes

Exact source revision recorded 28 Oct 2026 03:51:21 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2026-118370

Published

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.

Source published: 28 Oct 2026 02:03:19 UTC
Source modified: 28 Oct 2026 02:03:19 UTC
Observed here: 28 Oct 2026 03:51:21 UTC
Source terms: CVE Program Terms of Use

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 8.2 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

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