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CVE-2026-44637

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a signed integer overflow in the SIXEL parser's image-buffer doubling loop can lead to an out-of-bounds heap write in sixel_decode_raw_impl. context->pos_x grows by repeat_count on every sixel character with no upper bound check. Once pos_x approaches INT_MAX, the expression "pos_x + repeat_count" used to size the image buffer overflows signed int. Depending on how the overflow wraps, the resize che
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d544fdaa6281c459201da0146fc417d50914924b267f4396e90cf096650f318d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6e1f96a983fd5339efc3f53ed333cd05ac80caad86c9d0e2be6b7ea9665b3fef · sha256:cbfb52300659dfa5… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6e1f96a983fd5339efc3f53ed333cd05ac80caad86c9d0e2be6b7ea9665b3fef · sha256:cbfb52300659dfa5… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"libsixel","vendor":"saitoha","versions":[{"status":"affected","version":">= 0.11.0, < 1.8.7-r2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6e1f96a983fd5339efc3f53ed333cd05ac80caad86c9d0e2be6b7ea9665b3fef · sha256:cbfb52300659dfa5… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6e1f96a983fd5339efc3f53ed333cd05ac80caad86c9d0e2be6b7ea9665b3fef · sha256:cbfb52300659dfa5… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6e1f96a983fd5339efc3f53ed333cd05ac80caad86c9d0e2be6b7ea9665b3fef · sha256:cbfb52300659dfa5… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6e1f96a983fd5339efc3f53ed333cd05ac80caad86c9d0e2be6b7ea9665b3fef · sha256:cbfb52300659dfa5… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/saitoha/libsixel/security/advisories/GHSA-9jm7-77gr-qghv","tags":["x_refsource_CONFIRM"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-9jm7-77gr-qghv"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6e1f96a983fd5339efc3f53ed333cd05ac80caad86c9d0e2be6b7ea9665b3fef · sha256:cbfb52300659dfa5… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-9jm7-77gr-qghv"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6e1f96a983fd5339efc3f53ed333cd05ac80caad86c9d0e2be6b7ea9665b3fef · sha256:cbfb52300659dfa5… · /containers/adp/0/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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