CVE-2026-57941

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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 (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — Patch released this week

Also known asEUVD-2026-90896 (ENISA EUVD) · GHSA-w59m-qjff-crxx (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Use After Free vulnerability in Apache HTTP Server's mod_http2 via shared session->bbtmp re-entrancy

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

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
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
0.6%
EPSS %ILE
48th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-11). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

October 1, 2026

Last Modified

October 5, 2026

Advisory Details (2)

Auto-updated Nov 8, 2026
Patch available.
Web page

oss-security - CVE-2026-57941: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy

http://www.openwall.com/lists/oss-security/2026/10/01/19
Web pageMentions a patch (unverified)

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

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

Patch Availability(10)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatmod_http2-0:2.0.26-6.el9_8.32026-11-11redhat
redhatmod_http2-0:2.0.29-5.el10_3.12026-11-11redhat
redhatmod_http2-0:2.0.29-4.el10_2.32026-11-11redhat
redhatmod_http2-0:2.0.29-2.el10_0.32026-11-11redhat
redhatmod_http2-0:2.0.26-7.el9_9.12026-11-11redhat
redhatmod_http2-0:2.0.26-2.el9_4.42026-11-11redhat
redhatmod_http2-0:2.0.26-4.el9_6.32026-11-11redhat
ubuntuapache2-utils (2.4.66-2ubuntu2.7) @ resolute2026-11-11ubuntu
ubuntulibapache2-mod-proxy-uwsgi (2.4.52-1ubuntu4.24) @ jammy2026-11-11ubuntu
redhathttpd-main-2.4.69-1.hum12026-10-02redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

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~deb13u1 (59 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
apache22.4.65-2 ... 2.4.68-2 (30 versions)
  • every version up to 2.4.69-1~deb13u1: fixed in 2.4.69-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
apache22.4.65-2 ... 2.4.69-1~deb13u1 (31 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.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 20× in last 7d / 87× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 247 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 147 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  2. 2026-11-12 08:10 UTCEchelonGraph re-scored
  3. 2026-11-12 08:10 UTCVendor advisory
  4. 2026-11-12 08:10 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  6. 2026-11-11 06:56 UTCEchelonGraph re-scored
  7. 2026-11-11 06:56 UTCVendor advisory
  8. 2026-11-11 06:56 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  10. 2026-11-10 05:42 UTCEchelonGraph re-scored
  11. 2026-11-10 05:42 UTCVendor advisory
  12. 2026-11-10 05:42 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  14. 2026-11-09 04:29 UTCEchelonGraph re-scored
  15. 2026-11-09 04:29 UTCVendor advisory
  16. 2026-11-09 04:29 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  18. 2026-11-08 03:16 UTCEchelonGraph re-scored
  19. 2026-11-08 03:16 UTCVendor advisory
  20. 2026-11-08 03:16 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  22. 2026-11-07 02:02 UTCEchelonGraph re-scored
  23. 2026-11-07 02:02 UTCVendor advisory
  24. 2026-11-07 02:02 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.6% · 47th percentile
Show 75 more
  1. 2026-11-06 12:55 UTCOSV refresh
  2. 2026-11-06 00:49 UTCEchelonGraph re-scored
  3. 2026-11-06 00:49 UTCVendor advisory
  4. 2026-11-06 00:49 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  6. 2026-11-04 23:36 UTCEchelonGraph re-scored
  7. 2026-11-04 23:36 UTCVendor advisory
  8. 2026-11-04 23:36 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  10. 2026-11-03 22:22 UTCEchelonGraph re-scored
  11. 2026-11-03 22:22 UTCVendor advisory
  12. 2026-11-03 22:22 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-11-02 21:03 UTCEchelonGraph re-scored
  15. 2026-11-02 21:03 UTCVendor advisory
  16. 2026-11-02 21:03 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  18. 2026-11-01 19:49 UTCEchelonGraph re-scored
  19. 2026-11-01 19:49 UTCVendor advisory
  20. 2026-11-01 19:48 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  22. 2026-10-31 18:34 UTCEchelonGraph re-scored
  23. 2026-10-31 18:34 UTCVendor advisory
  24. 2026-10-31 18:34 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  26. 2026-10-31 05:51 UTCEchelonGraph re-scored
  27. 2026-10-31 05:51 UTCVendor advisory
  28. 2026-10-31 05:51 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  29. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  30. 2026-10-30 04:38 UTCEchelonGraph re-scored
  31. 2026-10-30 04:38 UTCVendor advisory
  32. 2026-10-30 04:38 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  33. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  34. 2026-10-29 03:24 UTCEchelonGraph re-scored
  35. 2026-10-29 03:24 UTCVendor advisory
  36. 2026-10-29 03:24 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  37. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  38. 2026-10-28 02:11 UTCEchelonGraph re-scored
  39. 2026-10-28 02:11 UTCVendor advisory
  40. 2026-10-28 02:11 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  41. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  42. 2026-10-27 00:58 UTCEchelonGraph re-scored
  43. 2026-10-27 00:58 UTCVendor advisory
  44. 2026-10-27 00:58 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  45. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  46. 2026-10-25 19:59 UTCEchelonGraph re-scored
  47. 2026-10-25 19:59 UTCVendor advisory
  48. 2026-10-25 19:59 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  49. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  50. 2026-10-25 14:17 UTCEchelonGraph re-scored
  51. 2026-10-24 18:45 UTCEchelonGraph re-scored
  52. 2026-10-24 18:45 UTCVendor advisory
  53. 2026-10-24 18:45 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  55. 2026-10-23 17:32 UTCEchelonGraph re-scored
  56. 2026-10-23 17:32 UTCVendor advisory
  57. 2026-10-23 17:32 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  58. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  59. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  60. 2026-10-22 16:18 UTCEchelonGraph re-scored
  61. 2026-10-22 16:18 UTCVendor advisory
  62. 2026-10-22 16:18 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  63. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  64. 2026-10-21 14:26 UTCEchelonGraph re-scored
  65. 2026-10-21 14:26 UTCVendor advisory
  66. 2026-10-21 14:26 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  68. 2026-10-20 13:12 UTCEchelonGraph re-scored
  69. 2026-10-20 13:12 UTCVendor advisory
  70. 2026-10-20 13:11 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  72. 2026-10-19 11:55 UTCEchelonGraph re-scored
  73. 2026-10-19 11:55 UTCVendor advisory
  74. 2026-10-19 11:55 UTCGHSA enrichmentGHSA-w59m-qjff-crxx · GitHub severity CRITICAL · GitHub CVSS 9.8
  75. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile

Frequently asked(5)

What is CVE-2026-57941?
CVE-2026-57941 is a critical-severity vulnerability; its CVE record was published on October 1, 2026. Use After Free vulnerability in Apache HTTP Server's mod_http2 via shared session->bbtmp re-entrancy This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.
When was the CVE record for CVE-2026-57941 published?
The CVE record for CVE-2026-57941 was published on October 1, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 5, 2026; the record at its source may have been updated since.
Is CVE-2026-57941 actively exploited?
CVE-2026-57941 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-57941?
CVE-2026-57941 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-57941?
A fix for CVE-2026-57941 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-57941 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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