A widely used web server vulnerability with critical memory corruption risk in config regex; rapid patch available.
CVE-2026-44631
Buffer underwrite in Apache HTTP Server via crafted regex in config; upgrade to 2.4.68.
Is CVE-2026-44631 being exploited?
Not confirmed. CVE-2026-44631 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 0.50% probability of exploitation in the next 30 days.
How severe is CVE-2026-44631?
CVE-2026-44631 is rated Critical with a CVSS score of 9.8. 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-2026-44631?
Yes. A fix has been recorded for CVE-2026-44631. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-44631 affect?
CVE-2026-44631 affects Apache HTTP Server 2.4.0-2.4.67. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-44631?
Upgrade to 2.4.68; restart service
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote memory corruption via crafted regex in config; could crash server or enable exploitation.
Immediate action required
- affected>= 2.4.0 and <= 2.4.67
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.