Vulnerability in Apache Software Foundation Apache HTTP Server

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)
• EPSS: 69% chance of exploitation in the next 30 days (higher than 99% of CVEs)

[ Description ]Official description

An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known "slow loris" attack pattern. This has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.57. Users are recommended to upgrade to version 2.4.58, which fixes the issue.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• NCSC-NL22 Oct 2026NCSC-2026-0448

  Vulnerabilities fixed in Oracle Fusion Middleware Translated from Dutch

  Probability/damage H/HCVE-2026-54513CVE-2026-56741CVE-2026-59649+191 more CVEs
• CERT-FR21 Oct 2026CERTFR-2026-AVI-1355

  Multiple vulnerabilities in Oracle Weblogic Translated from French

  Multiple vulnerabilities have been discovered in Oracle Weblogic. They allow an attacker to cause remote denial of service, a breach of data confidentiality and a breach of data integrity.

  CVE-2026-41855CVE-2026-59645CVE-2026-41853+26 more CVEs
• BSI CERT-Bund20 Oct 2026WID-SEC-2026-4078

  Oracle Fusion Middleware: Multiple vulnerabilities Translated from German

  CVE-2026-91212CVE-2023-43622CVE-2026-42779+191 more CVEs

[ References ]References

• httpd.apache.org/security/vulnerabilities_24.htmlvendor-advisory
• security.netapp.com/advisory/ntap-20231027-0011