Apache HTTP Server is ubiquitous; a 9.8 use-after-free in mod_http2 can enable RCE or widespread DoS, impacting internet-facing web infrastructure.
CVE-2026-57941
Use-after-free in Apache mod_http2 enabling RCE or DoS
Is CVE-2026-57941 being exploited?
Not confirmed. CVE-2026-57941 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 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-57941?
CVE-2026-57941 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-2026-57941?
Yes. A fix has been recorded for CVE-2026-57941. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-57941 affect?
CVE-2026-57941 affects Apache HTTP Server 2.4.0 through 2.4.68 (mod_http2). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-57941?
Upgrade to vendor-fixed Apache httpd release immediately; if not possible, disable HTTP/2 and apply WAF filters.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution or server crash via crafted HTTP/2 requests exploiting a use-after-free in mod_http2.
Immediate action required
- affected>= 2.4.0 and <= 2.4.68
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.