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CVE-2026-33018

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 load_gif() function in fromgif.c, where a single sixel_frame_t object is reused across all frames of an animated GIF and gif_init_frame() unconditionally frees and reallocates frame->pixels between frames without consulting the object's reference count. Because the public API explicitly provides sixel_frame_ref() to retain a frame and sixel_frame_
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:200bca65013deb5766eb5bd98e7875eee26cd62ac0760278a519d772278bb284
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"libsixel","vendor":"saitoha","versions":[{"status":"affected","version":"< 1.8.7-rc1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f818d37635a65c27c5294518ef084f835d321edeb7d9314a04d28e58ccc823af · sha256:e76c73b731997e49… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f818d37635a65c27c5294518ef084f835d321edeb7d9314a04d28e58ccc823af · sha256:e76c73b731997e49… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-416","description":"CWE-416: Use After Free","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f818d37635a65c27c5294518ef084f835d321edeb7d9314a04d28e58ccc823af · sha256:e76c73b731997e49… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1","tags":["x_refsource_MISC"],"url":"https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f818d37635a65c27c5294518ef084f835d321edeb7d9314a04d28e58ccc823af · sha256:e76c73b731997e49… · /containers/cna/references/1
{"name":"https://github.com/saitoha/libsixel/security/advisories/GHSA-w46f-jr9f-rgvp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-w46f-jr9f-rgvp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f818d37635a65c27c5294518ef084f835d321edeb7d9314a04d28e58ccc823af · sha256:e76c73b731997e49… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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