CVE-2026-33018
- Source
- https://cve.org/CVERecord?id=CVE-2026-33018
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33018.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-33018
- Aliases
-
- GHSA-w46f-jr9f-rgvp
- Downstream
- Published
- 2026-04-14T21:45:42.261Z
- Modified
- 2026-07-08T08:12:27.190345813Z
- Severity
-
- 7.0 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- libsixel: Use-After-Free in load_gif()
- Details
-
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain a Use-After-Free vulnerability via the loadgif() function in fromgif.c, where a single sixelframet object is reused across all frames of an animated GIF and gifinitframe() unconditionally frees and reallocates frame->pixels between frames without consulting the object's reference count. Because the public API explicitly provides sixelframeref() to retain a frame and sixelframegetpixels() to access the raw pixel buffer, a callback following this documented usage pattern will hold a dangling pointer after the second frame is decoded, resulting in a heap use-after-free confirmed by ASAN. Any application using sixelhelperloadimagefile() with a multi-frame callback to process user-supplied animated GIFs is affected, with a reliable crash as the minimum impact and potential for code execution. This issue has been fixed in version 1.8.7-r1.
- Database specific
{ "unresolved_ranges": [ { "source": "AFFECTED_FIELD", "extracted_events": [ { "fixed": "1.8.7-rc1" } ] } ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33018.json", "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-416" ] }- References
Affected packages
Git / github.com/saitoha/libsixel
Affected ranges
- Type
- GIT
- Repo
- https://github.com/saitoha/libsixel
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
{ "source": [ "CPE_RANGE", "REFERENCES" ], "cpe": "cpe:2.3:a:saitoha:libsixel:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "0" }, { "fixed": "1.8.7-r1" } ] }