Stack overflow in the parse_tag function in libass/ass_parse.c in libass before 0.15.0…
Priority MEDIUM 43CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-770.
Summary
Stack overflow in the parse_tag function in libass/ass_parse.c in libass before 0.15.0 allows remote attackers to cause a denial of service or remote code execution via a crafted file.
Why it matters now
EPSS 0.0265 85th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libass_project:libass:*:*:*:*:*:*:*:* | before 0.15.0 | Vulnerable | Libass Project |
- cpe:2.3:a:libass_project:libass:*:*:*:*:*:*:*:* Versions before 0.15.0 Vulnerable ·Libass Project
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2020-24994
- 2026-10-03 Alias added: GHSA-qrhf-wgfc-f8cx
References
More Libass Project Libass vulnerabilities
- TI-2020-16244 In libass 0.14.0, the `ass_outline_construct`'s call to `outline_stroke` causes a signed integer overflow. CVSS 3.1HIGH 8.8
- TI-2016-06698 The check_allocations function in libass/ass_shaper.c in libass before 0.13.4 allows… CVSS 3.0HIGH 7.5
- TI-2016-06697 Buffer overflow in the calc_coeff function in libass/ass_blur.c in libass before 0.13.4… CVSS 3.0HIGH 7.5
- TI-2016-06696 The wrap_lines_smart function in ass_render.c in libass before 0.13.4 allows remote… CVSS 3.1HIGH 7.5
- TI-2020-18678 libass 0.15.x before 0.15.1 has a heap-based buffer overflow in decode_chars (called from… CVSS 3.1HIGH 7.8
Sources
- CVE-2020-24994 · CVE Program
- CVE-2020-24994 · NVD
- FIRST EPSS
- GHSA-qrhf-wgfc-f8cx · GitHub Advisory Database · CC BY 4.0
- CVE-2020-24994 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences