CVE-2026-28780

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-06. 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 — Patch released 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: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
71%
KEV
Not listed

Published

May 5, 2026

Last Modified

September 14, 2026

Advisory Details (13)

Auto-updated Sep 14, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support

https://access.redhat.com/errata/RHSA-2026:36846
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support

https://access.redhat.com/errata/RHSA-2026:36831
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Serv

https://access.redhat.com/errata/RHSA-2026:36373
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:27201
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:27200
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:22140
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:21433
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:21391
generic

oss-security - CVE-2026-28780: Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()

http://www.openwall.com/lists/oss-security/2026/05/05/9
generic Patch Available🔴 Active Exploitation

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

https://httpd.apache.org/security/vulnerabilities_24.html
redhat Patch Available

2466913 – (CVE-2026-28780) CVE-2026-28780 Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow

Affected: Red Hat Enterprise Linux 9

https://bugzilla.redhat.com/show_bug.cgi?id=2466913
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-28780
redhat Patch Available

Affected: Red Hat Enterprise Linux 6",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28780.json

Vendor Advisories for CVE-2026-28780(13)

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

Patch Availability(14)

Vendor / EcosystemFixed in / PatchReleasedSource
redhathttpd-0:2.4.53-11.el9_2.152026-09-14redhat
ubuntulibapache2-mod-proxy-uwsgi (2.4.58-1ubuntu8.12) @ noble2026-09-14ubuntu
ubuntuapache2-utils (2.4.18-2ubuntu3.17+esm18) @ xenial2026-09-14ubuntu
redhathttpd-0:2.4.57-11.el9_4.52026-09-10redhat
redhathttpd-0:2.4.62-4.el9_6.62026-09-01redhat
redhathttpd-0:2.4.63-1.el10_0.42026-07-28redhat
redhathttpd:2.4-8060020260702195216.ad008a3a2026-07-08redhat
redhathttpd:2.4-8040020260702193120.522a0ee42026-07-08redhat
redhathttpd:2.4-8080020260702200145.63b345852026-07-07redhat
redhathttpd2026-06-22redhat
redhatjbcs-httpd24-httpd-0:2.4.62-13.el7jbcs2026-06-22redhat
redhathttpd:2.4-8100020260519200905.489197e62026-06-01redhat
redhathttpd-0:2.4.63-13.el10_2.12026-05-27redhat
redhathttpd-0:2.4.62-13.el9_8.12026-05-27redhat

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

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.67-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.67-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.67-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.67-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.67-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
apache22.4.48-3.1 ... 2.4.66-8 (82 versions)2.4.67-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
apache22.4.57-2 ... 2.4.67-1~deb12u1 (46 versions)2.4.67-1~deb12u2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
apache22.4.65-2 ... 2.4.67-1~deb13u1 (22 versions)2.4.67-1~deb13u2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
apache22.4.65-2 ... 2.4.67-1~deb13u3 (24 versions)2.4.67-1—

Weakness Classification(2)

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 15× in last 7d / 51× 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.

Showing the most recent 100 of 468 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-28780?
CVE-2026-28780 is a critical vulnerability published on May 5, 2026. Heap-based Buffer Overflow vulnerability in modproxyajp of Apache HTTP Server. If modproxyajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to modproxyajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue…
When was CVE-2026-28780 disclosed?
CVE-2026-28780 was first published in the National Vulnerability Database on May 5, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28780 actively exploited?
CVE-2026-28780 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 29.5% of all scored CVEs.
What is the CVSS score of CVE-2026-28780?
CVE-2026-28780 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-28780?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28780, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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