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[UPDATE] [medium] nghttp2: Vulnerability allows denial of service

mediumCVE-2026-27135
A remote, anonymous attacker can exploit a vulnerability in nghttp2 to carry out a denial of service attack.

CSIRTS triage

vendor: nghttp2product: nghttp2Denial of service
What
A vulnerability can be exploited by a remote attacker to carry out a denial of service attack.
Who is affected
Deployments of nghttp2 are affected by this vulnerability.
Urgency
Remediation is medium urgency due to the potential for denial-of-service attacks.
Action
Update to the latest version of nghttp2.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity
medium
Published
2026-07-02
Exploitation
Not in CISA KEV at last sync
Language
Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0775

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-27135coverage & exploitation statusNVD · CVE.org

Recent advisories for nghttp2

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from CERT-Bund (BSI) Security Advisories