Vulnerability in Apache Software Foundation Apache HttpComponents Core

[ Description ]Official description

Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending oversized compressed header blocks before the HTTP/2 SETTINGS acknowledgement causes the configured header list size limit to be applied.

[ 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-1349

  Multiple vulnerabilities in Oracle Database Server Translated from French

  Multiple vulnerabilities have been discovered in Oracle Database Server. Some of them allow an attacker to cause remote arbitrary code execution, remote denial of service and a breach of data confidentiality.

  CVE-2026-91499CVE-2026-93565CVE-2026-93494+41 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
• BSI CERT-Bund20 Oct 2026WID-SEC-2026-4056

  Atlassian products (Bamboo, Bitbucket, Confluence, Crucible, Fisheye and Jira): Multiple vulnerabilities Translated from German

  CVE-2026-13676CVE-2026-50750CVE-2026-53404+72 more CVEs

[ References ]References

• lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sdvendor-advisory