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CVE-2026-33021

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain a use-after-free vulnerability in sixel_encoder_encode_bytes() because sixel_frame_init() stores the caller-owned pixel buffer pointer directly in frame->pixels without making a defensive copy. When a resize operation is triggered, sixel_frame_convert_to_rgb888() unconditionally frees this caller-owned buffer and replaces it with a new internal allocation, leaving the caller with a dan
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1b295cc6a395317f03028929a785b827406b9726dee9330a04693db0bb14dcc0
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_v5affected
    urn:baitaphish:normalized-source-record:v2:1fe57a90fc025d34e835e7118a8cc5a088d08029819423d6596d5f590b9dba11 · sha256:37b35f2c47fe8701… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1fe57a90fc025d34e835e7118a8cc5a088d08029819423d6596d5f590b9dba11 · sha256:37b35f2c47fe8701… · /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:v2:1fe57a90fc025d34e835e7118a8cc5a088d08029819423d6596d5f590b9dba11 · sha256:37b35f2c47fe8701… · /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:v2:1fe57a90fc025d34e835e7118a8cc5a088d08029819423d6596d5f590b9dba11 · sha256:37b35f2c47fe8701… · /containers/cna/references/1
{"name":"https://github.com/saitoha/libsixel/security/advisories/GHSA-j6m5-2cc7-3whc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-j6m5-2cc7-3whc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1fe57a90fc025d34e835e7118a8cc5a088d08029819423d6596d5f590b9dba11 · sha256:37b35f2c47fe8701… · /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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