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[UPDATE] [high] HTTP/2 implementations: Vulnerability allows denial of service

highCVE-2026-49975
A remote, anonymous attacker can exploit a vulnerability in various HTTP/2 implementations to conduct a denial of service attack.

CSIRTS triage

product: HTTP/2 implementationsDenial of service
What
A vulnerability in various HTTP/2 implementations allows a remote, anonymous attacker to conduct a denial of service attack.
Who is affected
Deployments of affected HTTP/2 implementations are at risk.
Urgency
Remediation is high urgency due to the potential for service disruption.
Action
Users should update to the latest version of their HTTP/2 implementations to mitigate this vulnerability.

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
high
Published
2026-07-09
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-2026-1791

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-2026-49975coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for HTTP/2 implementations

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