CVE-2026-27135

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.8%, top 47% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m, epss
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.9%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. Prior to version 1.68.1, the nghttp2 library stops reading the incoming data when user facing public API nghttp2_session_terminate_session or nghttp2_session_terminate_session2 is called by the application. They might be called internally by the library when it detects the situation that is subject to connection error. Due to the missing internal state validation, the library keeps reading the rest of the data after one of those APIs is called. Then receiving a malformed frame that causes FRAME_SIZE_ERROR causes assertion failure. nghttp2 v1.68.1 adds missing state validation to avoid assertion failure. No known workarounds are available.

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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
EPSS PROB
0.9%
EPSS %ILE
58th
KEV
Not listed

Published

March 18, 2026

Last Modified

September 8, 2026

Advisory Details (4)

Auto-updated May 13, 2026
Patch available. Sources: github.
genericMentions a patch (unverified)

[SECURITY] [DLA 4581-1] nghttp2 security update

https://lists.debian.org/debian-lts-announce/2026/05/msg00025.html
generic

oss-security - nghttp2 Denial of service: Assertion failure due to the missing state validation

http://www.openwall.com/lists/oss-security/2026/03/20/3
githubMentions a patch (unverified)

Denial of service: Assertion failure due to the missing state validation · Advisory · nghttp2/nghttp2 · GitHub

https://github.com/nghttp2/nghttp2/security/advisories/GHSA-6933-cjhr-5qg6
generic

Fix missing iframe->state validations to avoid assertion failure · nghttp2/nghttp2@5c7df8f · GitHub

https://github.com/nghttp2/nghttp2/commit/5c7df8fa815ac1004d9ecb9d1f7595c4d37f46e1

Vendor Advisories for CVE-2026-27135(20)

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

Patch Availability(30)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatnghttp22026-06-22redhat
redhatjbcs-httpd24-nghttp2-0:1.64.0-3.el7jbcs2026-06-22redhat
redhatrhaiis/model-opt-cuda-rhel9:17806819842026-06-10redhat
redhatrhcos-412.86.202605271418-02026-06-04redhat
redhatrhcos-413.92.202605271328-02026-06-04redhat
redhatrhcos-418.94.202605260517-02026-06-03redhat
redhatrhcos-416.94.202605200242-02026-05-29redhat
redhatrhcos-4.19.9.6.202605201155-02026-05-27redhat
redhatrhaiis/vllm-cuda-rhel9:17792236542026-05-20redhat
redhatrhcos-417.94.202605112123-02026-05-20redhat
redhatrhaiis/vllm-rocm-rhel9:17792236512026-05-20redhat
redhatrhcos-414.92.202605060243-02026-05-13redhat
redhatrhcos-415.92.202605060220-02026-05-13redhat
redhatrhaiis/vllm-spyre-rhel9:17782445462026-05-12redhat
redhatrhaiis/vllm-rocm-rhel9:17782445312026-05-11redhat
redhatrhaiis/vllm-cuda-rhel9:17782746662026-05-11redhat
redhatrhaiis/model-opt-cuda-rhel9:17782445592026-05-11redhat
redhatdiscovery/discovery-ui-rhel9:17781567562026-05-07redhat
redhatrhpam-7/rhpam-smartrouter-rhel8:7.13.5-4.17773257082026-05-05redhat
redhatrhui5/rhua-tp-rhel9:17774595042026-04-29redhat
redhatrhui5/rhua-rhel9:17768688422026-04-23redhat
redhatnodejs:20-9060020260422064119.rhel92026-04-22redhat
redhatnodejs:20-9040020260421133644.rhel92026-04-22redhat
redhatinsights-proxy/insights-proxy-container-rhel9:17768689612026-04-22redhat
redhatnghttp2-0:1.64.0-2.el10_0.12026-04-20redhat
redhatnghttp2-0:1.33.0-3.el8_2.42026-04-16redhat
redhatnghttp2-0:1.43.0-5.el9_4.42026-04-16redhat
redhatnghttp2-0:1.33.0-5.el8_8.22026-04-16redhat
redhatnghttp2-0:1.33.0-4.el8_6.32026-04-16redhat
redhatnghttp2-0:1.43.0-5.el9_0.42026-04-16redhat

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

(8 across 8 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
nghttp2—
  • every version up to 1.68.1: fixed in 1.68.1
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
nghttp2—
  • every version up to 1.68.1: fixed in 1.68.1
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
nghttp2—
  • every version up to 1.68.1: fixed in 1.68.1
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
nghttp2—
  • every version up to 1.68.1-r0: fixed in 1.68.1-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
nghttp21.43.0-1, 1.43.0-1+deb11u1, 1.43.0-1+deb11u2
  • every version up to 1.43.0-1+deb11u3: fixed in 1.43.0-1+deb11u3
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
nghttp21.52.0-1, 1.52.0-1+deb12u1, 1.52.0-1+deb12u2
  • every version up to 1.52.0-1+deb12u3: fixed in 1.52.0-1+deb12u3
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
nghttp21.64.0-1.1
  • every version up to 1.64.0-1.1+deb13u1: fixed in 1.64.0-1.1+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
nghttp21.64.0-1.1, 1.68.0-1, 1.68.0-2
  • every version up to 1.68.1-1: fixed in 1.68.1-1
—

Weakness Classification(1)

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 7× in last 7d / 23× 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 230 total refreshes for this CVE.

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

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

Frequently asked(5)

What is CVE-2026-27135?
CVE-2026-27135 is a high vulnerability published on March 18, 2026. nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. Prior to version 1.68.1, the nghttp2 library stops reading the incoming data when user facing public API nghttp2sessionterminatesession or nghttp2sessionterminatesession2 is called by the application. They might be…
When was CVE-2026-27135 disclosed?
CVE-2026-27135 was first published on March 18, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27135 actively exploited?
CVE-2026-27135 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (58th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-27135?
CVE-2026-27135 has a CVSS base score of 7.5 (the CNA's own assessment, by github_m; NVD's own analysis pending).
How do I remediate CVE-2026-27135?
A fix for CVE-2026-27135 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-27135 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-2026-27135

Explore →

Is Your Infrastructure Affected by CVE-2026-27135?

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

Book a Demo →Browse All CVEs