CVE catalog

CVE-2020-36430

libass: CVE-2020-36430

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jul 20, 2021, 7:15:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.08% · Oct 25, 2026

libass 0.15.x before 0.15.1 has a heap-based buffer overflow in decode_chars (called from decode_font and process_text) because the wrong integer data type is used for subtraction.

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	libass	sid	`1:0.17.5-1`	fixed
Debian	libass	forky	`1:0.17.5-1`	fixed
Debian	libass	trixie	`1:0.17.3-1+deb13u1`	fixed
Debian	libass	bookworm	`1:0.17.1-1`	fixed
Debian	libass	bookworm-security	`1:0.17.1-1+deb12u1`	fixed
Opensuse	libass	leap 15.3	`0.14.0-3.9.1`	fixed
Opensuse	libass	leap 15.2	`0.14.0-lp152.4.9.1`	fixed
Suse	libass	linux enterprise module for desktop applications 15 sp2	`0.14.0-3.9.1`	fixed
Suse	libass	linux enterprise module for desktop applications 15 sp3	`0.14.0-3.9.1`	fixed
Suse	libass	linux enterprise high performance computing 15-espos	`0.14.0-3.9.1`	fixed
Suse	libass	linux enterprise high performance computing 15-ltss	`0.14.0-3.9.1`	fixed
Suse	libass	linux enterprise high performance computing 15 sp1-espos	`0.14.0-3.9.1`	fixed
Suse	libass	linux enterprise high performance computing 15 sp1-ltss	`0.14.0-3.9.1`	fixed
Suse	libass	linux enterprise server 15-ltss	`0.14.0-3.9.1`	fixed
Suse	libass	linux enterprise server 15 sp1-bcl	`0.14.0-3.9.1`	fixed
Suse	libass	linux enterprise server 15 sp1-ltss	`0.14.0-3.9.1`	fixed
Suse	libass	linux enterprise server for sap applications 15	`0.14.0-3.9.1`	fixed
Suse	libass	linux enterprise server for sap applications 15 sp1	`0.14.0-3.9.1`	fixed
Suse	libass	manager proxy 4.0	`0.14.0-3.9.1`	fixed
Suse	libass	manager retail branch server 4.0	`0.14.0-3.9.1`	fixed
Suse	libass	manager server 4.0	`0.14.0-3.9.1`	fixed
Suse	libass	enterprise storage 6	`0.14.0-3.9.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libass	source	sid	`1:0.15.0-2`	not yet assigned	Not reported	Not reported
Debian	libass	source	forky	`1:0.15.0-2`	not yet assigned	Not reported	Not reported
Debian	libass	source	trixie	`1:0.15.0-2`	not yet assigned	Not reported	Not reported
Debian	libass	source	bookworm	`1:0.15.0-2`	not yet assigned	Not reported	Not reported
Opensuse	libass	rpm	leap 15.3	`0.14.0-3.9.1`	Not reported	OPENSUSE-SU-2021:2792-1	Not reported
Opensuse	libass	rpm	leap 15.2	`0.14.0-lp152.4.9.1`	Not reported	OPENSUSE-SU-2021:1174-1	Not reported
Suse	libass	rpm	linux enterprise module for desktop applications 15 sp2	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	linux enterprise module for desktop applications 15 sp3	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	linux enterprise high performance computing 15-espos	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	linux enterprise high performance computing 15-ltss	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	linux enterprise high performance computing 15 sp1-espos	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	linux enterprise high performance computing 15 sp1-ltss	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	linux enterprise server 15-ltss	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	linux enterprise server 15 sp1-bcl	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	linux enterprise server 15 sp1-ltss	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	linux enterprise server for sap applications 15	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	linux enterprise server for sap applications 15 sp1	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	manager proxy 4.0	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	manager retail branch server 4.0	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	manager server 4.0	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported
Suse	libass	rpm	enterprise storage 6	`0.14.0-3.9.1`	Not reported	SUSE-SU-2021:2792-1	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libass9]Fixed
Source package: [libass]
Details (2)
- 1:0.17.1-1 · amd64 · bookworm
  Fixed · Fixed: 1:0.15.0-2
  dsa · libass · debian · bookworm; dsa · libass · debian · 12
- 1:0.17.1-1 · arm64 · bookworm
  Fixed · Fixed: 1:0.15.0-2
  dsa · libass · debian · bookworm; dsa · libass · debian · 12
[libass-dev]Fixed
Source package: [libass]
Details (2)
- 1:0.17.1-1 · amd64 · bookworm
  Fixed · Fixed: 1:0.15.0-2
  dsa · libass · debian · bookworm; dsa · libass · debian · 12
- 1:0.17.1-1 · arm64 · bookworm
  Fixed · Fixed: 1:0.15.0-2
  dsa · libass · debian · bookworm; dsa · libass · debian · 12

[Debian 13 (Trixie)]

[libass9]Fixed
Source package: [libass]
Details (2)
- 1:0.17.3-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 1:0.15.0-2
  dsa · libass · debian · 13
- 1:0.17.3-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 1:0.15.0-2
  dsa · libass · debian · 13
[libass-dev]Fixed
Source package: [libass]
Details (2)
- 1:0.17.3-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 1:0.15.0-2
  dsa · libass · debian · 13
- 1:0.17.3-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 1:0.15.0-2
  dsa · libass · debian · 13

Observed: Oct 23, 2026, 5:51:51 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]