CVE-2026-76641
Out-of-bounds read in Expat XML parser causing memory corruption or crash.
Is CVE-2026-76641 being exploited?
Not confirmed. CVE-2026-76641 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.35% probability of exploitation in the next 30 days.
How severe is CVE-2026-76641?
CVE-2026-76641 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-76641?
Not known from our data. No patch reference has been recorded for CVE-2026-76641, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-76641 affect?
CVE-2026-76641 affects Expat <= 2.8.3, Applications using XML_ExternalEntityParserCreate. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-76641?
Apply vendor patch when released; disable external entity parsing and sanitize XML input.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Processing crafted XML with external-entity parsers can trigger out-of-bounds reads, leading to segfaults, memory corruption, and possible remote code execution in some contexts.
Patch when possible
- affected<= 2.8.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.