CVE catalog

CVE-2016-5421

curl: CVE-2016-5421

Severity: High · CVSS 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Aug 3, 2016, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 8.04% · Oct 25, 2026

Use-after-free vulnerability in libcurl before 7.50.1 allows attackers to control which connection is used or possibly have unspecified other impact via unknown vectors.

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	curl	sid	`8.23.0-1`	fixed
Debian	curl	forky	`8.22.0-1`	fixed
Debian	curl	trixie	`8.14.1-2+deb13u5`	fixed
Debian	curl	trixie-security	`8.14.1-2+deb13u7`	fixed
Debian	curl	bookworm	`7.88.1-10+deb12u15`	fixed
Debian	curl	bookworm-security	`7.88.1-10+deb12u5`	fixed
Alpine	curl	3.10	`7.50.1-r0`	fixed
Alpine	curl	3.11	`7.50.1`	fixed
Alpine	curl	3.12	`7.50.1-r0`	fixed
Alpine	curl	3.13	`7.50.1-r0`	fixed
Alpine	curl	3.14	`7.50.1-r0`	fixed
Alpine	curl	3.15	`7.50.1-r0`	fixed
Alpine	curl	3.16	`7.50.1-r0`	fixed
Alpine	curl	3.17	`7.50.1-r0`	fixed
Alpine	curl	3.18	`7.50.1-r0`	fixed
Alpine	curl	3.19	`7.50.1-r0`	fixed
Alpine	curl	3.2	`7.49.1-r1`	fixed
Alpine	curl	3.20	`7.50.1-r0`	fixed
Alpine	curl	3.21	`7.50.1-r0`	fixed
Alpine	curl	3.22	`7.50.1-r0`	fixed
Alpine	curl	3.23	`7.50.1-r0`	fixed
Alpine	curl	3.24	`7.50.1-r0`	fixed
Alpine	curl	3.3	`7.49.1-r1`	fixed
Alpine	curl	3.4	`7.50.1-r0`	fixed
Alpine	curl	3.5	`7.50.1-r0`	fixed
Alpine	curl	3.6	`7.50.1`	fixed
Alpine	curl	3.7	`7.50.1`	fixed
Alpine	curl	3.8	`7.50.1`	fixed
Alpine	curl	3.9	`7.50.1-r0`	fixed
Ubuntu	curl	14.04	`7.32.0-1ubuntu1`	vulnerable
Ubuntu	curl	14.04	`7.33.0-1ubuntu1`	vulnerable
Ubuntu	curl	14.04	`7.34.0-1ubuntu1`	vulnerable
Ubuntu	curl	14.04	`7.35.0-1ubuntu1`	vulnerable
Ubuntu	curl	14.04	`7.35.0-1ubuntu2`	vulnerable
Ubuntu	curl	14.04	`7.35.0-1ubuntu2.1`	vulnerable
Ubuntu	curl	14.04	`7.35.0-1ubuntu2.2`	vulnerable
Ubuntu	curl	14.04	`7.35.0-1ubuntu2.3`	vulnerable
Ubuntu	curl	14.04	`7.35.0-1ubuntu2.5`	vulnerable
Ubuntu	curl	14.04	`7.35.0-1ubuntu2.6`	vulnerable
Ubuntu	curl	14.04	`7.35.0-1ubuntu2.7`	vulnerable
Ubuntu	curl	14.04	`7.35.0-1ubuntu2.8`	fixed
Ubuntu	curl	16.04	`7.43.0-1ubuntu2`	vulnerable
Ubuntu	curl	16.04	`7.45.0-1ubuntu1`	vulnerable
Ubuntu	curl	16.04	`7.46.0-1ubuntu1`	vulnerable
Ubuntu	curl	16.04	`7.47.0-1ubuntu1`	vulnerable
Ubuntu	curl	16.04	`7.47.0-1ubuntu2`	vulnerable
Ubuntu	curl	16.04	`7.47.0-1ubuntu2.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	curl	source	sid	`7.50.1-1`	not yet assigned	Not reported	Not reported
Debian	curl	source	forky	`7.50.1-1`	not yet assigned	Not reported	Not reported
Debian	curl	source	trixie	`7.50.1-1`	not yet assigned	Not reported	Not reported
Debian	curl	source	bookworm	`7.50.1-1`	not yet assigned	Not reported	Not reported
Alpine	curl	apk	3.10	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.11	`7.50.1`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.12	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.13	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.14	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.15	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.16	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.17	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.18	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.19	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.2	`7.49.1-r1`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.20	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.21	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.22	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.23	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.24	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.3	`7.49.1-r1`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.4	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.5	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.6	`7.50.1`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.7	`7.50.1`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.8	`7.50.1`	Not reported	ALPINE-CVE-2016-5421	Not reported
Alpine	curl	apk	3.9	`7.50.1-r0`	Not reported	ALPINE-CVE-2016-5421	Not reported
Ubuntu	curl	deb	14.04	`7.35.0-1ubuntu2.8`	Not reported	UBUNTU-CVE-2016-5421	Not reported
Ubuntu	curl	deb	16.04	`7.47.0-1ubuntu2.1`	Not reported	UBUNTU-CVE-2016-5421	Not reported

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[curl]Unknown
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
[libcurl3-gnutls]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
[libcurl3-nss]Unknown
Source package: [curl]
Details (4)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
[libcurl4]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
[libcurl4-doc]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · all · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · all · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · all · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · all · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · all · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · all · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
[libcurl4-gnutls-dev]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
[libcurl4-nss-dev]Unknown
Source package: [curl]
Details (4)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
[libcurl4-openssl-dev]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12

[Debian 13 (Trixie)]

[curl]Unknown
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
[libcurl3t64-gnutls]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
[libcurl4-doc]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · all · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · all · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · all · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · all · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · all · trixie-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
[libcurl4-gnutls]Unknown
Source package: [curl]
Details (2)
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
[libcurl4-gnutls-dev]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
[libcurl4-openssl-dev]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
[libcurl4t64]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Fixed · Fixed: 7.50.1-1
  dsa · curl · debian · 13

Observed: Oct 23, 2026, 5:22:21 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]