CVE catalog

CVE-2019-9515

h2o: CVE-2019-9515

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Aug 13, 2019, 5:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 87.29% · Oct 25, 2026

Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of service. The attacker sends a stream of SETTINGS frames to the peer. Since the RFC requires that the peer reply with one acknowledgement per SETTINGS frame, an empty SETTINGS frame is almost equivalent in behavior to a ping. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

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`	fixed
Debian	trafficserver	bookworm	`9.2.5+ds-0+deb12u4`	fixed
Debian	trafficserver	bookworm-security	`9.2.5+ds-0+deb12u4`	fixed
Alpine	nodejs	3.10	`10.16.3-r0`	fixed
Alpine	nodejs	3.11	`10.16.3-r0`	fixed
Alpine	nodejs	3.12	`10.16.3-r0`	fixed
Alpine	nodejs	3.13	`10.16.3-r0`	fixed
Alpine	nodejs	3.14	`10.16.3-r0`	fixed
Alpine	nodejs	3.15	`10.16.3-r0`	fixed
Alpine	nodejs	3.16	`10.16.3-r0`	fixed
Alpine	nodejs	3.17	`10.16.3-r0`	fixed
Alpine	nodejs	3.18	`10.16.3-r0`	fixed
Alpine	nodejs	3.19	`10.16.3-r0`	fixed
Alpine	nodejs	3.20	`10.16.3-r0`	fixed
Alpine	nodejs	3.21	`10.16.3-r0`	fixed
Alpine	nodejs	3.22	`10.16.3-r0`	fixed
Alpine	nodejs	3.23	`10.16.3-r0`	fixed
Alpine	nodejs	3.24	`10.16.3-r0`	fixed
Alpine	nodejs	3.9	`10.16.3-r0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	h2o	source	bookworm	`2.2.5+dfsg2-3`	not yet assigned	Not reported	[934886]
Debian	trafficserver	source	bookworm	`8.0.5+ds-1`	not yet assigned	Not reported	[934887]
Alpine	nodejs	apk	3.10	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.11	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.12	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.13	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.14	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.15	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.16	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.17	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.18	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.19	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.20	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.21	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.22	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.23	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.24	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported
Alpine	nodejs	apk	3.9	`10.16.3-r0`	Not reported	ALPINE-CVE-2019-9515	Not reported

[Debian bug #934886][Debian bug #934887]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[h2o]Unknown
Details (2)
- 2.2.5+dfsg2-7 · amd64 · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
- 2.2.5+dfsg2-7 · arm64 · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
[h2o-doc]Unknown
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · all · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
- 2.2.5+dfsg2-7 · all · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
[libh2o0.13]Unknown
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · amd64 · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
- 2.2.5+dfsg2-7 · arm64 · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
[libh2o-dev]Unknown
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · amd64 · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
- 2.2.5+dfsg2-7 · arm64 · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
[libh2o-dev-common]Unknown
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · all · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
- 2.2.5+dfsg2-7 · all · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
[libh2o-evloop0.13]Unknown
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · amd64 · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
- 2.2.5+dfsg2-7 · arm64 · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
[libh2o-evloop-dev]Unknown
Source package: [h2o]
Details (2)
- 2.2.5+dfsg2-7 · amd64 · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
- 2.2.5+dfsg2-7 · arm64 · bookworm
  Fixed · Fixed: 2.2.5+dfsg2-3
  dsa · h2o · debian · bookworm; dsa · h2o · debian · 12
[trafficserver]Unknown
Details (4)
- 9.2.5+ds-0+deb12u4 · amd64 · bookworm
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12
- 9.2.5+ds-0+deb12u4 · arm64 · bookworm
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12
- 9.2.5+ds-0+deb12u4 · amd64 · bookworm-security
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12
- 9.2.5+ds-0+deb12u4 · arm64 · bookworm-security
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12
[trafficserver-dev]Unknown
Source package: [trafficserver]
Details (4)
- 9.2.5+ds-0+deb12u4 · amd64 · bookworm
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12
- 9.2.5+ds-0+deb12u4 · arm64 · bookworm
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12
- 9.2.5+ds-0+deb12u4 · amd64 · bookworm-security
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12
- 9.2.5+ds-0+deb12u4 · arm64 · bookworm-security
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12
[trafficserver-experimental-plugins]Unknown
Source package: [trafficserver]
Details (4)
- 9.2.5+ds-0+deb12u4 · amd64 · bookworm
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12
- 9.2.5+ds-0+deb12u4 · arm64 · bookworm
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12
- 9.2.5+ds-0+deb12u4 · amd64 · bookworm-security
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12
- 9.2.5+ds-0+deb12u4 · arm64 · bookworm-security
  Fixed · Fixed: 8.0.5+ds-1
  dsa · trafficserver · debian · bookworm; dsa · trafficserver · debian · 12

Observed: Oct 23, 2026, 5:45:29 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]