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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 an updated version of the nghttp2 package that addresses this vulnerability. Users of Red Hat Enterprise Linux 10 and related products should apply the update as described in the Red Hat advisory (https://access.redhat.com/articles/11258). No additional mitigation steps are indicated beyond applying the official patch.

Description

A security vulnerability in the libnghttp2 library, which implements HTTP/2 in C, allows HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests. This issue is tracked as CVE-2026-58055 and has been rated with moderate severity by Red Hat. An update addressing this vulnerability is available for Red Hat Enterprise Linux 10 and related products.

References

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