CVE catalog

CVE-2016-4817

h2o: CVE-2016-4817

Severity: Low
Source: [NVD] · [CVE record]
EPSS: 4.45% · Oct 25, 2026

lib/http2/connection.c in H2O before 1.7.3 and 2.x before 2.0.0-beta5 mishandles HTTP/2 disconnection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly execute arbitrary code via a crafted packet.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	h2o	bookworm	`2.2.5+dfsg2-7`	not affected

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	h2o	source	bookworm	`Not affected`	unimportant	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[h2o]Not affected
Details (2)
- 2.2.5+dfsg2-7 · amd64 · bookworm
  Not affected
  dsa · h2o · debian · bookworm
- 2.2.5+dfsg2-7 · arm64 · bookworm
  Not affected
  dsa · h2o · debian · bookworm
[h2o-doc]Not affected
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · all · bookworm
  Not affected
  dsa · h2o · debian · bookworm
- 2.2.5+dfsg2-7 · all · bookworm
  Not affected
  dsa · h2o · debian · bookworm
[libh2o0.13]Not affected
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · amd64 · bookworm
  Not affected
  dsa · h2o · debian · bookworm
- 2.2.5+dfsg2-7 · arm64 · bookworm
  Not affected
  dsa · h2o · debian · bookworm
[libh2o-dev]Not affected
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · amd64 · bookworm
  Not affected
  dsa · h2o · debian · bookworm
- 2.2.5+dfsg2-7 · arm64 · bookworm
  Not affected
  dsa · h2o · debian · bookworm
[libh2o-dev-common]Not affected
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · all · bookworm
  Not affected
  dsa · h2o · debian · bookworm
- 2.2.5+dfsg2-7 · all · bookworm
  Not affected
  dsa · h2o · debian · bookworm
[libh2o-evloop0.13]Not affected
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · amd64 · bookworm
  Not affected
  dsa · h2o · debian · bookworm
- 2.2.5+dfsg2-7 · arm64 · bookworm
  Not affected
  dsa · h2o · debian · bookworm
[libh2o-evloop-dev]Not affected
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · amd64 · bookworm
  Not affected
  dsa · h2o · debian · bookworm
- 2.2.5+dfsg2-7 · arm64 · bookworm
  Not affected
  dsa · h2o · debian · bookworm

Observed: Oct 23, 2026, 5:21:47 PM UTC

References

[https://security-tracker.debian.org/tracker/CVE-2016-4817]

[Debian Security Tracker] · [FIRST EPSS]