CVE-2026-58055
A remote, anonymous attacker can exploit a vulnerability in nghttp2 to manipulate data.
CSIRTS triage
- What
- A vulnerability in nghttp2 allows for data manipulation.
- Who is affected
- Remote, anonymous users of nghttp2 are affected.
- Urgency
- Remediation is medium urgency due to the potential for exploitation and medium severity.
- Action
- Monitor for updates and apply patches when available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.
Advisory coverage (3)
- medium[UPDATE] [medium] nghttp2: Vulnerability allows data manipulationcert-bund · 2026-07-03
- mediumCVE-2026-58055: nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries …nvd · 2026-06-28
- mediumCVE-2026-58055: nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Lengthmsrc · 2026-06-09
External references
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[](https://www.csirts.com/cve/CVE-2026-58055)