CVE Explorer
CVE-2026-33023
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. In versions 1.8.7 and prior, when built with the --with-gdk-pixbuf2 option, a use-after-free vulnerability exists in load_with_gdkpixbuf() in loader.c. The cleanup path manually frees the sixel_frame_t object and its internal buffers without consulting the reference count, even though the object was created via the refcounted constructor sixel_frame_new() and exposed to the public callback. A callback that calls sixel
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-r1"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:fe0b46ddc4d0ca5814645d9bae144a48692dab009ee21d0b749a0e7bdcefef0c · sha256:27f8976c735b6de7… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:fe0b46ddc4d0ca5814645d9bae144a48692dab009ee21d0b749a0e7bdcefef0c · sha256:27f8976c735b6de7… · /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_v5cweurn:baitaphish:normalized-source-record:v2:fe0b46ddc4d0ca5814645d9bae144a48692dab009ee21d0b749a0e7bdcefef0c · sha256:27f8976c735b6de7… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 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_v5referenceurn:baitaphish:normalized-source-record:v2:fe0b46ddc4d0ca5814645d9bae144a48692dab009ee21d0b749a0e7bdcefef0c · sha256:27f8976c735b6de7… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-hr25-g2j6-qjw6"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:fe0b46ddc4d0ca5814645d9bae144a48692dab009ee21d0b749a0e7bdcefef0c · sha256:27f8976c735b6de7… · /containers/adp/0/references/0
{"name":"https://github.com/saitoha/libsixel/security/advisories/GHSA-hr25-g2j6-qjw6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-hr25-g2j6-qjw6"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:fe0b46ddc4d0ca5814645d9bae144a48692dab009ee21d0b749a0e7bdcefef0c · sha256:27f8976c735b6de7… · /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.