CVE-2026-33019
- Source
- https://cve.org/CVERecord?id=CVE-2026-33019
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33019.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-33019
- Aliases
-
- GHSA-c854-ffg9-g72c
- Downstream
- Published
- 2026-04-14T21:49:25Z
- Modified
- 2026-10-28T02:31:07Z
- Severity
-
- 7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H CVSS Calculator
- Summary
- libsixel: Integer overflow leads to Out-of-bounds Read in img2sixel
- Details
-
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain an integer overflow leading to an out-of-bounds heap read in the --crop option handling of img2sixel, where positive coordinates up to INT_MAX are accepted without overflow-safe bounds checking. In sixel_encoder_do_clip(), the expression clip_w + clip_x overflows to a large negative value when clip_x is INT_MAX, causing the bounds guard to be skipped entirely, and the unclamped coordinate is passed through sixel_frame_clip() to clip(), which computes a source pointer far beyond the image buffer and passes it to memmove(). An attacker supplying a specially crafted crop argument with any valid image can trigger an out-of-bounds read in the heap, resulting in a reliable crash and potential information disclosure. This issue has been fixed in version 1.8.7-r1.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-125", "CWE-190" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33019.json" }- 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
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0" }, { "fixed": "1.8.7-r1" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "original_tag": "v1.8.7-r1", "range": [ { "fixed": "6d628cf43548e1f2739cbb13afcc6e8257868db5" } ], "source": "REFERENCES_TAG" }, { "cpe": "cpe:2.3:a:saitoha:libsixel:*:*:*:*:*:*:*:*", "range": [ { "introduced": "0" }, { "fixed": "1.8.7-r1" } ], "source": "CPE_RANGE" } ] }