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CVE-2026-33020

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain an integer overflow which leads to a heap buffer overflow via sixel_frame_convert_to_rgb888() in frame.c, where allocation size and pointer offset computations for palettised images (PAL1, PAL2, PAL4) are performed using int arithmetic before casting to size_t. For images whose pixel count exceeds INT_MAX / 4, the overflow produces an undersized heap allocation for the conversion buffe
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:642303d4e4e674c48d030275dc6e65848950e8a5341134cd08700e36f8af3cb3
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:v2:69f2b5648e41c172548a95301579b567785d5d11c3c1a7d8c19d14a386ae66da · sha256:add5e723cd42e493… · /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:v2:69f2b5648e41c172548a95301579b567785d5d11c3c1a7d8c19d14a386ae66da · sha256:add5e723cd42e493… · /containers/cna/problemTypes/0/descriptions/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:v2:69f2b5648e41c172548a95301579b567785d5d11c3c1a7d8c19d14a386ae66da · sha256:add5e723cd42e493… · /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:v2:69f2b5648e41c172548a95301579b567785d5d11c3c1a7d8c19d14a386ae66da · sha256:add5e723cd42e493… · /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:v2:69f2b5648e41c172548a95301579b567785d5d11c3c1a7d8c19d14a386ae66da · sha256:add5e723cd42e493… · /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:v2:69f2b5648e41c172548a95301579b567785d5d11c3c1a7d8c19d14a386ae66da · sha256:add5e723cd42e493… · /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_v5reference
    urn:baitaphish:normalized-source-record:v2:69f2b5648e41c172548a95301579b567785d5d11c3c1a7d8c19d14a386ae66da · sha256:add5e723cd42e493… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-2xgm-4x47-2x2p"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:69f2b5648e41c172548a95301579b567785d5d11c3c1a7d8c19d14a386ae66da · sha256:add5e723cd42e493… · /containers/adp/0/references/0
{"name":"https://github.com/saitoha/libsixel/security/advisories/GHSA-2xgm-4x47-2x2p","tags":["x_refsource_CONFIRM"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-2xgm-4x47-2x2p"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:69f2b5648e41c172548a95301579b567785d5d11c3c1a7d8c19d14a386ae66da · sha256:add5e723cd42e493… · /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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