CVE-2026-27135

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 91% 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: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

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
7.5(medium)
EPSS
51.5%
KEV
Not listed

Published

March 18, 2026

Last Modified

June 30, 2026

Advisory Details (4)

Auto-updated May 13, 2026
Patch available. Sources: github.
generic Patch Available

[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
github Patch Available

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 / EcosystemFixed in / PatchReleasedSource
redhatrhaiis/model-opt-cuda-rhel9:17806819842026-06-10redhat
redhatrhcos-413.92.202605271328-02026-06-04redhat
redhatrhcos-412.86.202605271418-02026-06-04redhat
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/model-opt-cuda-rhel9:17782445592026-05-11redhat
redhatrhaiis/vllm-rocm-rhel9:17782445312026-05-11redhat
redhatrhaiis/vllm-cuda-rhel9:17782746662026-05-11redhat
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
redhatnghttp2-0:1.33.0-4.el8_4.32026-04-16redhat
redhatnghttp2-0:1.33.0-3.el8_2.42026-04-16redhat
redhatnghttp2-0:1.43.0-5.el9_2.42026-04-16redhat
redhatnghttp2-0:1.43.0-6.el9_6.12026-04-16redhat
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

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(1)

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

Additional Vendor Advisories

(7)

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 11× in last 7d / 48× 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 113 total refreshes for this CVE.

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

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 in the National Vulnerability Database on March 18, 2026, with the most recent update on June 30, 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 51.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-27135?
CVE-2026-27135 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-27135?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27135, 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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