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Vulnerability record · CVE-2020-36430 · published 20 July 2021

CVE-2020-36430: Libass project libass out-of-bounds write vulnerability

LLibass Project · Libass

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.

7.8 CVSS 3.1 High EPSS 1.1% · top 36.4% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 6.8
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26674 Issue TrackingPatchThird Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libass/OSV-2020-2099.yaml Third Party Advisory
https://github.com/libass/libass/commit/017137471d0043e0321e377ed8da48e45a3ec632 PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6JUXFQUJ32GWG5E46A63DFD
https://security.gentoo.org/glsa/202208-13 Third Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26674 Issue TrackingPatchThird Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libass/OSV-2020-2099.yaml Third Party Advisory
https://github.com/libass/libass/commit/017137471d0043e0321e377ed8da48e45a3ec632 PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6JUXFQUJ32GWG5E46A63DFD
https://security.gentoo.org/glsa/202208-13 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-36430), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.