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CVE-2026-44638

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a wrong NULL check after an allocation call in sixel_decode_raw and sixel_decode causes a NULL pointer dereference whenever the allocation fails. The check tests the address of the output parameter (always non-NULL) instead of the value the malloc returned. On allocation failure, the function continues and writes through a NULL pointer, crashing the process. This is a denial of service against any c
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c564d619aeef0eda3aa3f10eb08e8522f11cebbdf6b0ea514ef2ebbd444b8af4
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-476","description":"CWE-476: NULL Pointer Dereference","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cfc98351e4e303c8dbb55439f4d6c7ab5fb403d12db229b48c1e43dab11a5721 · sha256:e41ece080124feb1… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-690","description":"CWE-690: Unchecked Return Value to NULL Pointer Dereference","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cfc98351e4e303c8dbb55439f4d6c7ab5fb403d12db229b48c1e43dab11a5721 · sha256:e41ece080124feb1… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"libsixel","vendor":"saitoha","versions":[{"status":"affected","version":">= 1.0.0, < 1.8.7-r2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cfc98351e4e303c8dbb55439f4d6c7ab5fb403d12db229b48c1e43dab11a5721 · sha256:e41ece080124feb1… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"LOW","baseScore":2.5,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:cfc98351e4e303c8dbb55439f4d6c7ab5fb403d12db229b48c1e43dab11a5721 · sha256:e41ece080124feb1… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-476","description":"CWE-476: NULL Pointer Dereference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cfc98351e4e303c8dbb55439f4d6c7ab5fb403d12db229b48c1e43dab11a5721 · sha256:e41ece080124feb1… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-690","description":"CWE-690: Unchecked Return Value to NULL Pointer Dereference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cfc98351e4e303c8dbb55439f4d6c7ab5fb403d12db229b48c1e43dab11a5721 · sha256:e41ece080124feb1… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-wpx3-h5g8-qr3w"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:cfc98351e4e303c8dbb55439f4d6c7ab5fb403d12db229b48c1e43dab11a5721 · sha256:e41ece080124feb1… · /containers/adp/0/references/0
{"name":"https://github.com/saitoha/libsixel/security/advisories/GHSA-wpx3-h5g8-qr3w","tags":["x_refsource_CONFIRM"],"url":"https://github.com/saitoha/libsixel/security/advisories/GHSA-wpx3-h5g8-qr3w"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:cfc98351e4e303c8dbb55439f4d6c7ab5fb403d12db229b48c1e43dab11a5721 · sha256:e41ece080124feb1… · /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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