CVE catalog

CVE-2018-16840

curl: CVE-2018-16840

Severity: Medium · CVSS 5CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Published: Oct 30, 2018, 11:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 3.40% · Oct 25, 2026

A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.

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	`7.62.0-r0`	fixed
Alpine	curl	3.11	`7.62.0-r0`	fixed
Alpine	curl	3.12	`7.62.0-r0`	fixed
Alpine	curl	3.13	`7.62.0-r0`	fixed
Alpine	curl	3.14	`7.62.0-r0`	fixed
Alpine	curl	3.15	`7.62.0-r0`	fixed
Alpine	curl	3.16	`7.62.0-r0`	fixed
Alpine	curl	3.17	`7.62.0-r0`	fixed
Alpine	curl	3.18	`7.62.0-r0`	fixed
Alpine	curl	3.19	`7.62.0-r0`	fixed
Alpine	curl	3.20	`7.62.0-r0`	fixed
Alpine	curl	3.21	`7.62.0-r0`	fixed
Alpine	curl	3.22	`7.62.0-r0`	fixed
Alpine	curl	3.23	`7.62.0-r0`	fixed
Alpine	curl	3.24	`7.62.0-r0`	fixed
Alpine	curl	3.5	`7.61.1-r1`	fixed
Alpine	curl	3.6	`7.61.1-r1`	fixed
Alpine	curl	3.7	`7.61.1-r1`	fixed
Alpine	curl	3.8	`7.61.1-r1`	fixed
Alpine	curl	3.9	`7.62.0-r0`	fixed
Suse	curl	linux enterprise software development kit 11 sp4	`7.37.0-70.38.1`	fixed
Suse	curl-openssl1	linux enterprise server 11-security	`7.37.0-70.38.1`	fixed
Suse	curl	linux enterprise server 11 sp4	`7.37.0-70.38.1`	fixed
Suse	curl	linux enterprise server for sap applications 11 sp4	`7.37.0-70.38.1`	fixed
Suse	curl	linux enterprise desktop 12 sp3	`7.37.0-37.31.1`	fixed
Suse	curl	linux enterprise software development kit 12 sp3	`7.37.0-37.31.1`	fixed
Suse	curl	linux enterprise server 12 sp3	`7.37.0-37.31.1`	fixed
Suse	curl	linux enterprise server for sap applications 12 sp3	`7.37.0-37.31.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	curl	source	sid	`7.62.0-1`	not yet assigned	Not reported	Not reported
Debian	curl	source	forky	`7.62.0-1`	not yet assigned	Not reported	Not reported
Debian	curl	source	trixie	`7.62.0-1`	not yet assigned	Not reported	Not reported
Debian	curl	source	bookworm	`7.62.0-1`	not yet assigned	Not reported	Not reported
Alpine	curl	apk	3.10	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.11	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.12	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.13	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.14	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.15	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.16	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.17	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.18	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.19	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.20	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.21	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.22	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.23	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.24	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.5	`7.61.1-r1`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.6	`7.61.1-r1`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.7	`7.61.1-r1`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.8	`7.61.1-r1`	Not reported	ALPINE-CVE-2018-16840	Not reported
Alpine	curl	apk	3.9	`7.62.0-r0`	Not reported	ALPINE-CVE-2018-16840	Not reported
Suse	curl	rpm	linux enterprise software development kit 11 sp4	`7.37.0-70.38.1`	Not reported	SUSE-SU-2018:3681-1	Not reported
Suse	curl-openssl1	rpm	linux enterprise server 11-security	`7.37.0-70.38.1`	Not reported	SUSE-SU-2018:3681-1	Not reported
Suse	curl	rpm	linux enterprise server 11 sp4	`7.37.0-70.38.1`	Not reported	SUSE-SU-2018:3681-1	Not reported
Suse	curl	rpm	linux enterprise server for sap applications 11 sp4	`7.37.0-70.38.1`	Not reported	SUSE-SU-2018:3681-1	Not reported
Suse	curl	rpm	linux enterprise desktop 12 sp3	`7.37.0-37.31.1`	Not reported	SUSE-SU-2018:3608-1	Not reported
Suse	curl	rpm	linux enterprise software development kit 12 sp3	`7.37.0-37.31.1`	Not reported	SUSE-SU-2018:3608-1	Not reported
Suse	curl	rpm	linux enterprise server 12 sp3	`7.37.0-37.31.1`	Not reported	SUSE-SU-2018:3608-1	Not reported
Suse	curl	rpm	linux enterprise server for sap applications 12 sp3	`7.37.0-37.31.1`	Not reported	SUSE-SU-2018:3608-1	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: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  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: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  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: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
[libcurl4]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  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: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · all · bookworm
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · all · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · all · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · all · bookworm-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · all · bookworm-security
  Fixed · Fixed: 7.62.0-1
  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: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  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: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  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: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · bookworm; dsa · curl · debian · 12

[Debian 13 (Trixie)]

[curl]Unknown
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
[libcurl3t64-gnutls]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
[libcurl4-doc]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · all · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · all · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · all · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · all · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · all · trixie-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
[libcurl4-gnutls]Unknown
Source package: [curl]
Details (2)
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
[libcurl4-gnutls-dev]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
[libcurl4-openssl-dev]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
[libcurl4t64]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Fixed · Fixed: 7.62.0-1
  dsa · curl · debian · 13

Observed: Oct 23, 2026, 5:35:08 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]