Red Hat Security Advisory: nghttp2 security update
Affects Red Hat nghttp2Source GCVE Database
Not known to be exploited.
Data as of 3 Nov 2026, 04:46 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 13 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2 Nov 2026.
What to do
AI-suggested
Red Hat has released updated packages for libnghttp2 in Red Hat Enterprise Linux 9 and related products. Users should apply the security update as described in Red Hat advisory RHSA-2026:54662 and the referenced article https://access.redhat.com/articles/11258 to remediate this vulnerability.
Description
A moderate severity vulnerability (CVE-2026-58055) in the libnghttp2 library used by Red Hat Enterprise Linux 9 allows HTTP request/response smuggling and response-queue poisoning via ambiguous HTTP/1.1 Upgrade requests. This flaw affects multiple Red Hat Enterprise Linux 9 variants and related products. Red Hat has issued a security update to address this issue.