CVE-2026-49975

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-08. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 28%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests.

This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
28%
EPSS %ILE
98%
KEV
Not listed

Published

June 8, 2026

Last Modified

July 23, 2026

Advisory Details (4)

Auto-updated Jun 10, 2026
⚠️ Active exploitation confirmed. Patch available.
generic Patch Available

[SECURITY] [DLA 4620-1] apache2 security update

https://lists.debian.org/debian-lts-announce/2026/06/msg00009.html
generic

oss-security - CVE-2026-49975: Apache HTTP Server: mod_http2 denial of service

http://www.openwall.com/lists/oss-security/2026/06/08/16
generic Patch Available

oss-security - HTTP/2 Bomb affects Apache httpd, nginx, envoy, & pingora

http://www.openwall.com/lists/oss-security/2026/06/03/3
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-2026-49975(12)

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

Patch Availability(15)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuapache2-utils (2.4.18-2ubuntu3.17+esm19) @ xenial2026-07-26ubuntu
ubuntunginx-naxsi-ui (1.4.6-1ubuntu3.9+esm8) @ trusty2026-07-26ubuntu
ubuntunginx-light (1.28.3-2ubuntu1.5) @ resolute2026-07-26ubuntu
ubuntunginx-light (1.28.3-2ubuntu1.3) @ resolute2026-07-26ubuntu
ubuntulibapache2-mod-proxy-uwsgi (2.4.58-1ubuntu8.13) @ noble2026-07-26ubuntu
redhathttpd:2.4-8040020260702193120.522a0ee42026-07-08redhat
redhathttpd:2.4-8060020260702195216.ad008a3a2026-07-08redhat
redhathttpd:2.4-8080020260702200145.63b345852026-07-07redhat
redhatjbcs-httpd24-mod_http22026-06-22redhat
redhatjbcs-httpd24-mod_http2-0:2.0.29-10.el7jbcs2026-06-22redhat
redhatopenshift-service-mesh/proxyv2-rhel9:17816047242026-06-18redhat
redhatmod_http2-0:2.0.29-4.el10_2.12026-06-11redhat
redhathttpd-main-2.4.68-1.hum12026-06-10redhat
redhathttpd:2.4-8100020260608081321.489197e62026-06-10redhat
redhatmod_http2-0:2.0.26-6.el9_8.12026-06-10redhat

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.

Weakness Classification(2)

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

Additional Vendor Advisories

(5)

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 16× in last 7d / 90× 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 189 total refreshes for this CVE.

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

Publicly available exploits

(9 references)

Working exploit code is in the public domain (9 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCadminlove520/http2-bomb-detector
    First seen Jun 13, 2026

    HTTP/2 Bomb (CVE-2026-49975) non-destructive vulnerability detector for Nginx / Apache httpd. Zero-dependency Python.

    Open source ↗
  • GitHub PoCmindcodings/http2-bomb-detector
    First seen Jun 13, 2026

    HTTP/2 Bomb (CVE-2026-49975) non-destructive vulnerability detector for Nginx / Apache httpd. Zero-dependency Python.

    Open source ↗
  • GitHub PoCEQSTLab/CVE-2026-49975
    First seen Jun 10, 2026

    HTTP2-Bomb

    Open source ↗
  • GitHub PoCLSG-PolarBear/CVE-2026-49975
    First seen Jun 10, 2026

    CVE-2026-49975漏洞复现

    Open source ↗
  • GitHub PoCLiaoZiqi-GZFLS/CVE-2026-49975
    First seen Jun 10, 2026

    CVE-2026-49975

    Open source ↗
  • GitHub PoCrenzi25031469/CVE-2026-49975-HTTP-2-Bomb
    First seen Jun 8, 2026

    Disclosed on June 3, 2026, the "HTTP/2 Bomb" is an unauthenticated remote DoS that combines an HPACK compression bomb with a Slowloris-style hold to exhaust server memory. It affects default HTTP/2 configurations of **nginx, Apache httpd, Microsoft IIS, Envoy, and Cloudflare Pingora**.

    Open source ↗
  • GitHub PoCobrige/http2-bomb
    First seen Jun 5, 2026

    CVE-2026-49975 HTTP/2 Stream Amplification — Docker PoC with Web Console

    Open source ↗
  • GitHub PoCmrx-arafat/CVE-2026-49975-POC
    First seen Jun 4, 2026

    HTTP/2 Bomb PoC — CVE-2026-49975 (HPACK indexed reference bomb + flow-control stall)

    Open source ↗
  • GitHub PoCfevar54/Proof-of-Concept-POC---CVE-2026-49975-HTTP-2-Bomb-
    First seen Jun 3, 2026

    Este repositorio contiene un Proof of Concept (POC) para CVE-2026-49975, también conocida como HTTP/2 Bomb, una vulnerabilidad de denegación de servicio (DoS) remoto que afecta a la mayoría de los servidores web principales en su configuración HTTP/2 predeterminada, incluyendo:

    Open source ↗

Frequently asked(5)

What is CVE-2026-49975?
CVE-2026-49975 is a high vulnerability published on June 8, 2026. Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests. This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.
When was CVE-2026-49975 disclosed?
CVE-2026-49975 was first published in the National Vulnerability Database on June 8, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49975 actively exploited?
CVE-2026-49975 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28% probability of exploitation in the next 30 days, which ranks it in the top 2.1% of all scored CVEs.
What is the CVSS score of CVE-2026-49975?
CVE-2026-49975 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-49975?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49975, 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

Explore the affected products and dependency analysis for CVE-2026-49975

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