CVE-2026-27135

Highest-risk unexploited with PoCs

Exploit code exists, no confirmed in-the-wild activity, ranked by EPSS

Actively Exploited

Confirmed exploited in the wild, sorted by most recently updated

CVSS 7.5EPSS <1%

Published 2026-03-18Updated 2026-04-06

PoC

Vulnerability details

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CNAGitHub_M

EPSS score history

Sources

3 links

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CVE Organization RedHat Vuln DB NVD Analysis

Profile

CVSS

7.5

EPSS

<1%

Published

2026-03-18

Updated

2026-04-06

CNA

GitHub_M

Vendors

nghttp2

1 product

CPEs

cpe:/a:redhat:jboss_core_services:1::el7

cpe:/a:redhat:jboss_core_services:1::el8

cpe:/a:redhat:openshift:4.12::el8

cpe:/a:redhat:rhosemc:1.0::el8

cpe:/a:redhat:openshift:4.13::el9

cpe:/a:redhat:openshift:4.14::el9

cpe:/a:redhat:openshift:4.15::el9

cpe:/a:redhat:openshift:4.16::el9

cpe:/a:redhat:openshift:4.17::el9

cpe:/a:redhat:openshift:4.18::el9

cpe:/a:redhat:openshift:4.19::el9

cpe:/o:redhat:enterprise_linux_eus:10.0

cpe:/o:redhat:enterprise_linux:10.1

cpe:/a:redhat:enterprise_linux:8::appstream

cpe:/a:redhat:rhel_eus:9.4::appstream

cpe:/a:redhat:rhel_eus:9.6::appstream

cpe:/a:redhat:enterprise_linux:9::appstream

cpe:/o:redhat:enterprise_linux:8::baseos

cpe:/o:redhat:rhel_aus:8.2::baseos

cpe:/o:redhat:rhel_aus:8.4::baseos

cpe:/o:redhat:rhel_eus_long_life:8.4::baseos

cpe:/o:redhat:rhel_aus:8.6::baseos

cpe:/o:redhat:rhel_e4s:8.6::baseos

cpe:/o:redhat:rhel_tus:8.6::baseos

cpe:/o:redhat:rhel_e4s:8.8::baseos

cpe:/o:redhat:rhel_tus:8.8::baseos

cpe:/o:redhat:rhel_e4s:9.0::baseos

cpe:/o:redhat:rhel_e4s:9.2::baseos

cpe:/o:redhat:rhel_eus:9.4::baseos

cpe:/o:redhat:rhel_eus:9.6::baseos

cpe:/o:redhat:enterprise_linux:9::baseos

cpe:/a:redhat:enterprise_linux:8::crb

cpe:/a:redhat:rhel_eus:9.4::crb

cpe:/a:redhat:rhel_eus:9.6::crb

cpe:/a:redhat:enterprise_linux:9::crb

cpe:/a:redhat:ai_inference_server:3.2::el9

cpe:/a:redhat:ai_inference_server:3.3::el9

cpe:/a:redhat:discovery:2::el9

cpe:/a:redhat:hummingbird:1

cpe:/a:redhat:insights_proxy:1.5::el9

cpe:/a:redhat:jboss_core_services:1

cpe:/a:redhat:rhui:5::el9

cpe:/a:redhat:enterprise_linux:8

cpe:/o:redhat:enterprise_linux:8

cpe:/o:redhat:rhel_aus:8.2

cpe:/o:redhat:rhel_aus:8.4

cpe:/o:redhat:rhel_eus_long_life:8.4

cpe:/o:redhat:rhel_aus:8.6

cpe:/o:redhat:rhel_tus:8.6

cpe:/o:redhat:rhel_e4s:8.6

cpe:/o:redhat:rhel_tus:8.8

cpe:/o:redhat:rhel_e4s:8.8

cpe:/a:redhat:enterprise_linux:9

cpe:/o:redhat:enterprise_linux:9

cpe:/o:redhat:rhel_e4s:9.0

cpe:/o:redhat:rhel_e4s:9.2

cpe:/a:redhat:rhel_eus:9.4

cpe:/o:redhat:rhel_eus:9.4

cpe:/a:redhat:rhel_eus:9.6

cpe:/o:redhat:rhel_eus:9.6

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