CVE Explorer

CVE-2026-44636

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, signed integer overflow in sixel_encode_highcolor's allocation size calculation can lead to a heap buffer overflow. The public sixel_encode entry point validates only that width and height are greater than zero, with no upper bound. width and height are multiplied as plain int when computing the allocation size for paletted_pixels and normalized_pixels. Any caller that asks libsixel to encode a pixe

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:fe994d0287527c23ab067d1b417db9708970fc0b6ab461eb6db47513e8033382

Known exploited

Not asserted

Disputed

Stale source

Conflicts

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:v2:53d7504b854364fa1a5c48f8809dd236dd3ba8fd8de7aba5a847db9de4b8d8ba · sha256:c9f81f8c7e53bcf6… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer Overflow","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:53d7504b854364fa1a5c48f8809dd236dd3ba8fd8de7aba5a847db9de4b8d8ba · sha256:c9f81f8c7e53bcf6… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion

{"product":"libsixel","vendor":"saitoha","versions":[{"status":"affected","version":">= 1.4.4, < 1.8.7-r2"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:53d7504b854364fa1a5c48f8809dd236dd3ba8fd8de7aba5a847db9de4b8d8ba · sha256:c9f81f8c7e53bcf6… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:53d7504b854364fa1a5c48f8809dd236dd3ba8fd8de7aba5a847db9de4b8d8ba · sha256:c9f81f8c7e53bcf6… · /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:v2:53d7504b854364fa1a5c48f8809dd236dd3ba8fd8de7aba5a847db9de4b8d8ba · sha256:c9f81f8c7e53bcf6… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer Overflow","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:53d7504b854364fa1a5c48f8809dd236dd3ba8fd8de7aba5a847db9de4b8d8ba · sha256:c9f81f8c7e53bcf6… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"tags":["exploit"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-hx93-w8p2-ffh5"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:53d7504b854364fa1a5c48f8809dd236dd3ba8fd8de7aba5a847db9de4b8d8ba · sha256:c9f81f8c7e53bcf6… · /containers/adp/0/references/0

{"name":"https://github.com/saitoha/libsixel/security/advisories/GHSA-hx93-w8p2-ffh5","tags":["x_refsource_CONFIRM"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-hx93-w8p2-ffh5"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:53d7504b854364fa1a5c48f8809dd236dd3ba8fd8de7aba5a847db9de4b8d8ba · sha256:c9f81f8c7e53bcf6… · /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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