In libass 0.14.0, the `ass_outline_construct`'s call to `outline_stroke` causes a signed integer overflow.

The remote Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8815-1 advisory.

    It was discovered that libass incorrectly handled parsing operations for specific nested character     strings. An attacker could use this issue to cause libass to crash, resulting in a denial of service, or     possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04     LTS and Ubuntu 20.04 LTS. (CVE-2020-24994)

    It was discovered that libass incorrectly handled certain outline processing operations. An attacker could     use this issue to cause libass to crash, resulting in a denial of service. This issue only affected Ubuntu     18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-26682)

    It was discovered that libass incorrectly handled certain ASS subtitle files when measuring wrapped lines.
    An attacker could use this issue to cause libass to crash, resulting in a denial of service, or possibly     execute arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-61627)

    It was discovered that libass incorrectly handled certain Matroska subtitle chunks with negative ReadOrder     values. An attacker could use this issue to cause libass to crash, resulting in a denial of service, or     possibly execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-61626)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-032348 advisory.

    In libass 0.14.0, the `ass_outline_construct`'s call to `outline_stroke` causes a signed integer overflow.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

This update for libass fixes the following issues :

CVE-2020-26682: Fixed a signed integer overflow in the call to outline_stroke() (bsc#1177862).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for libass fixes the following issues :

  - CVE-2020-26682: Fixed a signed integer overflow in the     call to outline_stroke() (bsc#1177862).

This update was imported from the SUSE:SLE-15:Update update project.

The remote host is affected by the vulnerability described in GLSA-202012-12 (libass: User-assisted execution of arbitrary code)

    It was discovered that libass did not properly handle Advanced       Substation Alpha/Substation Alpha subtitle format files.
  Impact :

    A remote attacker could entice a user to process an a specially crafted       subtitle format file using an application linked against libass, possibly       resulting in execution of arbitrary code with the privileges of the       process or a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

ID	Name	Product	Family	Type	Severity
350176	Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 24.04 LTS / 26.04 LTS : libass vulnerabilities (USN-8815-1)	Nessus	Ubuntu Local Security Checks	Local	high
341250	Unity Linux 20.1050e / 20.1060e / 20.1070-8ae / 20.1070e Security Update: libass (UTSA-2026-032348)	Nessus	Unity Linux Local Security Checks	Local	high
148177	SUSE SLED15 / SLES15 Security Update : libass (SUSE-SU-2021:0936-1)	Nessus	SuSE Local Security Checks	Local	high
148153	openSUSE Security Update : libass (openSUSE-2021-472)	Nessus	SuSE Local Security Checks	Local	high
144591	GLSA-202012-12 : libass: User-assisted execution of arbitrary code	Nessus	Gentoo Local Security Checks	Local	high

Detections

Analytics

CVE-2020-26682

high

Tenable Plugins

high

high

high

high

high