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CVE-2026-58055VulnerabilityPublished Updated

Red Hat Security Advisory: nghttp2 security update

Affects Red Hat nghttp2Source GCVE Database

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Not known to be exploited.

Data as of 3 Nov 2026, 04:46 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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.

References

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