CVE-2026-56154

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-10-01. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Use After Free vulnerability in Apache HTTP Server's mod_rewrite when using lookahead (%{LA-U:HTTP:...})

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
59
EG Risk 59/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
33rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 1, 2026

Last Modified

October 1, 2026

Advisory Details (2)

Auto-updated Oct 1, 2026
⚠️ Active exploitation confirmed. Patch available.
generic

oss-security - CVE-2026-56154: Apache HTTP Server: mod_rewrite use-after-free via %{LA-U:HTTP:...}

http://www.openwall.com/lists/oss-security/2026/10/01/17
generic Patch Available🔴 Active Exploitation

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

https://httpd.apache.org/security/vulnerabilities_24.html

Vendor Advisories for CVE-2026-56154(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(7 across 7 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.69-r0: fixed in 2.4.69-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.69-r0: fixed in 2.4.69-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.69-r0: fixed in 2.4.69-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.69-r0: fixed in 2.4.69-r0
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
apache22.4.57-2 ... 2.4.69-1 (58 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
apache22.4.65-2 ... 2.4.69-1 (31 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
apache22.4.65-2 ... 2.4.68-2 (30 versions)
  • every version up to 2.4.69-1: fixed in 2.4.69-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 35× in last 7d / 35× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-05 07:13 UTCGHSA enrichment
  2. 2026-10-05 02:55 UTCEG score recompute
  3. 2026-10-05 02:55 UTCGHSA enrichment
  4. 2026-10-04 23:22 UTCEPSS rescore
  5. 2026-10-04 22:34 UTCGHSA enrichment
  6. 2026-10-04 18:16 UTCGHSA enrichment
  7. 2026-10-04 13:58 UTCGHSA enrichment
  8. 2026-10-04 09:39 UTCGHSA enrichment
  9. 2026-10-04 05:19 UTCGHSA enrichment
  10. 2026-10-04 01:01 UTCGHSA enrichment
  11. 2026-10-03 20:43 UTCGHSA enrichment
  12. 2026-10-03 16:25 UTCEG score recompute
  13. 2026-10-03 16:25 UTCGHSA enrichment
  14. 2026-10-03 14:26 UTCEPSS rescore
  15. 2026-10-03 12:08 UTCGHSA enrichment
  16. 2026-10-03 07:50 UTCGHSA enrichment
  17. 2026-10-03 03:31 UTCGHSA enrichment
  18. 2026-10-02 23:13 UTCGHSA enrichment
  19. 2026-10-02 18:53 UTCEG score recompute
  20. 2026-10-02 18:53 UTCGHSA enrichment
  21. 2026-10-02 17:56 UTCEPSS rescore
  22. 2026-10-02 14:34 UTCGHSA enrichment
  23. 2026-10-02 10:16 UTCGHSA enrichment
  24. 2026-10-02 05:58 UTCGHSA enrichment
  25. 2026-10-02 01:40 UTCEG score recompute
Show 10 more
  1. 2026-10-02 01:39 UTCGHSA enrichment
  2. 2026-10-01 21:21 UTCGHSA enrichment
  3. 2026-10-01 20:33 UTCGHSA enrichment
  4. 2026-10-01 20:29 UTCGHSA enrichment
  5. 2026-10-01 19:21 UTCEG score recompute▲ 9.80
  6. 2026-10-01 19:21 UTCGHSA enrichment
  7. 2026-10-01 19:20 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  8. 2026-10-01 17:27 UTCNVD update
  9. 2026-10-01 16:28 UTCEG score recompute
  10. 2026-10-01 16:25 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56154?
CVE-2026-56154 is a critical vulnerability published on October 1, 2026. Use After Free vulnerability in Apache HTTP Server's mod_rewrite when using lookahead (%{LA-U:HTTP:...}) This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.
When was CVE-2026-56154 disclosed?
CVE-2026-56154 was first published on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56154 actively exploited?
CVE-2026-56154 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56154?
CVE-2026-56154 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-56154?
A fix for CVE-2026-56154 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56154 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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