CVE-2026-54789

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (40th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week
7.5EG
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: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

mod_auth_openidc is an OpenID Certified authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. Prior to 2.4.19.4, an out-of-bounds read and a one-byte out-of-bounds write exist in the state-cookie parser of mod_auth_openidc. The issue is fixed in version 2.4.19.4 by stopping the scan at the string terminator so a value-less token is rejected. No in-product workarounds are available. As a stop-gap, an upstream reverse proxy or WAF that rejects or normalizes malformed Cookie headers (tokens lacking =) can reduce exposure, but upgrading is the recommended remediation.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation0.5% × 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 partial (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
0.5%
EPSS %ILE
40th
KEV
Not listed

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 partial (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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

August 21, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Aug 21, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

Out-of-bounds read and write in state cookie parsing · Advisory · OpenIDC/mod_auth_openidc · GitHub

https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-vgr5-qcpp-x2pr
GitHub commit

commit 8017478471cc (OpenIDC/mod_auth_openidc)

Fix landed in OpenIDC/mod_auth_openidc commit 8017478471cc — awaiting tagged release

https://github.com/OpenIDC/mod_auth_openidc/commit/8017478471cc071c49aa073c5c9be652a73a8630

Vendor Advisories for CVE-2026-54789(9)

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

Patch Availability(10)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatmod_auth_openidc:2.3-8100020260914112224.489197e62026-10-07redhat
redhatmod_auth_openidc-0:2.4.16.11-1.el10_2.12026-10-05redhat
redhatmod_auth_openidc-0:2.4.10-1.el9_6.32026-09-22redhat
redhatmod_auth_openidc-0:2.4.15-4.el10_0.22026-09-22redhat
redhatmod_auth_openidc-0:1.8.8-9.el7_9.22026-09-22redhat
redhatmod_auth_openidc:2.3-8040020260911120429.522a0ee42026-09-22redhat
redhatmod_auth_openidc:2.3-8060020260911120020.ad008a3a2026-09-22redhat
redhatmod_auth_openidc:2.3-8080020260916055033.63b345852026-09-22redhat
redhatmod_auth_openidc-0:2.4.9.4-1.el9_2.42026-09-22redhat
redhatmod_auth_openidc-0:2.4.9.4-4.el9_4.32026-09-22redhat

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libapache2-mod-auth-openidc2.4.12.3-2, 2.4.12.3-2+deb12u1, 2.4.12.3-2+deb12u2, 2.4.12.3-2+deb12u3, 2.4.12.3-2+deb12u4
  • every version up to 2.4.12.3-2+deb12u5: fixed in 2.4.12.3-2+deb12u5
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libapache2-mod-auth-openidc2.4.17-1
  • every version up to 2.4.17-1+deb13u1: fixed in 2.4.17-1+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libapache2-mod-auth-openidc2.4.17-1 ... 2.4.19.2-3 (10 versions)
  • every version up to 2.4.19.4-1: fixed in 2.4.19.4-1
—

Weakness Classification(2)

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

Additional Vendor Advisories

(1)

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 15× in last 7d / 83× 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 it from the CNA feed. 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). Most recent first.

Showing the most recent 100 of 127 refreshes 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 27 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:17 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-10-09 05:54 UTCEG score recompute
  11. 2026-10-09 05:54 UTCVendor advisory
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-08 04:55 UTCEG score recompute
  14. 2026-10-08 04:55 UTCVendor advisory
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-07 06:33 UTCVendor advisory
  17. 2026-10-06 19:21 UTCEG score recompute
  18. 2026-10-06 19:21 UTCVendor advisory
  19. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  20. 2026-10-06 07:49 UTCVendor advisory
  21. 2026-10-05 19:09 UTCEG score recompute
  22. 2026-10-05 19:09 UTCVendor advisory
  23. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  24. 2026-10-05 07:58 UTCEG score recompute
  25. 2026-10-05 07:58 UTCVendor advisory
Show 75 more
  1. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-10-04 20:48 UTCVendor advisory
  3. 2026-10-04 06:32 UTCVendor advisory
  4. 2026-10-03 19:24 UTCEG score recompute
  5. 2026-10-03 19:24 UTCVendor advisory
  6. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  7. 2026-10-03 06:51 UTCVendor advisory
  8. 2026-10-02 19:42 UTCEG score recompute
  9. 2026-10-02 19:42 UTCVendor advisory
  10. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  11. 2026-10-02 08:33 UTCVendor advisory
  12. 2026-10-01 21:25 UTCEG score recompute
  13. 2026-10-01 21:25 UTCVendor advisory
  14. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  15. 2026-10-01 07:37 UTCVendor advisory
  16. 2026-09-30 20:28 UTCEG score recompute
  17. 2026-09-30 20:28 UTCVendor advisory
  18. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  19. 2026-09-30 07:53 UTCVendor advisory
  20. 2026-09-29 16:11 UTCEG score recompute
  21. 2026-09-29 16:11 UTCVendor advisory
  22. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  23. 2026-09-29 00:25 UTCEG score recompute
  24. 2026-09-29 00:25 UTCVendor advisory
  25. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  26. 2026-09-28 13:08 UTCVendor advisory
  27. 2026-09-28 01:59 UTCVendor advisory
  28. 2026-09-27 14:41 UTCEG score recompute
  29. 2026-09-27 14:41 UTCVendor advisory
  30. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  31. 2026-09-27 02:29 UTCEG score recompute
  32. 2026-09-27 02:29 UTCVendor advisory
  33. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  34. 2026-09-25 09:34 UTCVendor advisory
  35. 2026-09-24 22:25 UTCEG score recompute
  36. 2026-09-24 22:25 UTCVendor advisory
  37. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  38. 2026-09-24 10:41 UTCVendor advisory
  39. 2026-09-23 23:28 UTCEG score recompute
  40. 2026-09-23 23:28 UTCVendor advisory
  41. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  42. 2026-09-23 11:57 UTCVendor advisory
  43. 2026-09-23 00:48 UTCEG score recompute
  44. 2026-09-23 00:48 UTCVendor advisory
  45. 2026-09-22 13:38 UTCVendor advisory
  46. 2026-09-22 02:30 UTCEG score recompute
  47. 2026-09-21 04:06 UTCEG score recompute
  48. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  49. 2026-09-19 18:36 UTCEG score recompute
  50. 2026-09-18 20:17 UTCEG score recompute
  51. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  52. 2026-09-18 01:50 UTCEG score recompute
  53. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  54. 2026-09-16 15:48 UTCEG score recompute
  55. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  56. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  57. 2026-09-15 06:15 UTCEG score recompute
  58. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  59. 2026-09-13 20:05 UTCEG score recompute
  60. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  61. 2026-09-12 21:47 UTCEG score recompute
  62. 2026-09-11 23:26 UTCEG score recompute
  63. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  64. 2026-09-11 12:06 UTCEG score recompute
  65. 2026-09-10 12:13 UTCEG score recompute
  66. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  67. 2026-09-09 01:47 UTCEG score recompute
  68. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  69. 2026-09-07 22:32 UTCEG score recompute
  70. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  71. 2026-09-07 00:12 UTCEG score recompute
  72. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  73. 2026-09-06 01:44 UTCEG score recompute
  74. 2026-09-04 16:16 UTCEG score recompute
  75. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 40th percentile

Related CVEs(same product + same vendor + same CWE)

Same vendor

1 shown

redhat:RHSA-2026:77369

Frequently asked(5)

What is CVE-2026-54789?
CVE-2026-54789 is a high-severity vulnerability; its CVE record was published on August 21, 2026. modauthopenidc is an OpenID Certified authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. Prior to 2.4.19.4, an out-of-bounds read and a one-byte out-of-bounds write exist in the state-cookie parser of…
When was the CVE record for CVE-2026-54789 published?
The CVE record for CVE-2026-54789 was published on August 21, 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 September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-54789 actively exploited?
CVE-2026-54789 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54789?
CVE-2026-54789 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54789?
A fix for CVE-2026-54789 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54789 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-54789

Explore →

Is Your Infrastructure Affected by CVE-2026-54789?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs