CVE-2026-27135
No exploitation reported by the sources we read.
- Published2026-03-18
- Fixed in1.68.1
- WeaknessCWE-617
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
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.
Timeline
dates in UTC- 2026-03-1818:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-27135?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-27135?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.68 | < 1.68.1 | 1.68.1 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- libnghttp2AlmaLinux:10all versions · fixed in 1.64.0-2.el10_1.1and 2 other packages
- libnghttp2AlmaLinux:9all versions · fixed in 1.43.0-6.el9_7.1and 2 other packages
- libnghttp2AlmaLinux:8all versions · fixed in 1.33.0-6.el8_10.2and 2 other packages
- nodejsAlmaLinux:9all versions · fixed in 1:20.20.2-1.module_el9.7.0+226+88d36870and 2 other packages
- nodejsAlmaLinux:9all versions · fixed in 1:24.14.1-2.module_el9.7.0+222+ef1c61e1and 4 other packages
- nodejsAlmaLinux:8all versions · fixed in 1:20.20.2-1.module_el8.10.0+4165+3f200bdaand 3 other packages
- nodejsAlmaLinux:8all versions · fixed in 1:22.22.2-1.module_el8.10.0+4158+e796f37fand 4 other packages
- nodejsAlmaLinux:8all versions · fixed in 1:24.14.1-2.module_el8.10.0+4160+4819ac42and 4 other packages
24 more package ranges on OSV.dev
Vendor advisories
Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.17.2
Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.2
Red Hat Security Advisory: A Subscription Management tool for finding and reporting Red Hat product usage
Red Hat Security Advisory: Red Hat Update Infrastructure 5.2 Technology Preview security update
Red Hat Security Advisory: Red Hat Update Infrastructure 5.1 security update
Red Hat Security Advisory: nodejs:20 security update
11 more advisories
Fix
- Update Nghttp2 to 1.68.1
- Vendor fix Red Hat Product Security RHSA-2026:82888 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. The steps to apply the upgraded images are different depending on the installation plan approval policy you used when installing the cert-manager Operator for Red Hat OpenShift. - If t…
- Vendor fix Red Hat Product Security RHSA-2026:14937 · 4 productsThe containers required to run Discovery can be installed through discovery-installer RPM. See the official documentation for more details.
- Vendor fix Red Hat Product Security RHSA-2026:11768 · 3 productsPlease consult the RHUI Technology Preview Release Notes at https://access.redhat.com/articles/7141172 for instructions on how to use this image set.
- Vendor fix Red Hat Product Security RHSA-2026:10065 · 4 productsThe container images provided by this release, apart from the installer, should be deployed using rhui-installer utility. See the official documentation for more details.
- Vendor fix Red Hat Product Security RHSA-2026:9874 · 31 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Advisories and patches
- github.comPatch
- github.comPatch · Vendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2026-03-18
- Last Modified
- 2026-10-15
- NVD status
- Modified
Frequently asked questions
What is CVE-2026-27135?
Is CVE-2026-27135 actively exploited?
What is the CVSS score for CVE-2026-27135?
Running nodejs:20? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
No credit card required · No monthly cap on website lookups · 250 API requests/month
Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
- Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.
Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.