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CVE-2026-118370

8.2 high Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 6

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-28 02:03
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-28 15:21
  3. StatusReceived → PublishedNVD modified 2026-10-28 02:03
  4. StatusPublished → ReceivedNVD modified 2026-10-28 03:17
  5. CVSS8.2 (v4.0, 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) → 8.2 (v4.0, 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)NVD modified 2026-10-28 03:17
  6. First seenCVSS 8.2 · libexpatNVD modified 2026-10-28 02:03

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 6