{"id":"CVE-2026-59959","state":"PUBLISHED","title":"SAIL: WebP decoder division by zero through malformed animated canvas metadata","description":"SAIL is a cross-platform library for loading and saving images with support for animation, metadata, and ICC profiles. Prior to version 1.0.2, the built-in WebP decoder can crash during loader initialization when processing a malformed animated WebP file with inconsistent container or `ANMF` frame metadata. In `sail_codec_load_init_v8_webp()` in `src/sail-codecs/webp/webp.c`, `WebPDemuxGetI` with `WEBP_FF_CANVAS_WIDTH` can return a zero `image_local->width`, which is then used as a divisor when calculating `bytes_per_pixel` from the image row size. The division happens before frame decoding and before generic image skeleton validation in `src/sail/sail_advanced.c`, causing an arithmetic fault and process termination. Applications accepting untrusted WebP images can consequently suffer denial of service; builds must include the affected WebP codec. This issue is fixed in version 1.0.2.","publishedAt":"2026-10-28T13:17:29.214Z","updatedAt":"2026-10-29T18:39:38.355Z","severity":{"score":4.8,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["HappySeaFox sail"],"affected":[{"vendor":"HappySeaFox","product":"sail","versions":[{"version":"< 1.0.2","status":"affected"}]}],"references":["https://github.com/HappySeaFox/sail/security/advisories/GHSA-5g8g-g347-84m8","https://github.com/HappySeaFox/sail/commit/495660135a4c62e416a1b357a4381dd30069229d","https://github.com/HappySeaFox/sail/tree/v1.0.2"],"weaknesses":["CWE-369"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/59xxx/CVE-2026-59959.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-59959","state":"PUBLISHED","datePublished":"2026-10-28T13:17:29.214Z","dateUpdated":"2026-10-29T18:39:38.355Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-07T18:49:15.608Z"},"containers":{"cna":{"title":"SAIL: WebP decoder division by zero through malformed animated canvas metadata","descriptions":[{"lang":"en","value":"SAIL is a cross-platform library for loading and saving images with support for animation, metadata, and ICC profiles. Prior to version 1.0.2, the built-in WebP decoder can crash during loader initialization when processing a malformed animated WebP file with inconsistent container or `ANMF` frame metadata. In `sail_codec_load_init_v8_webp()` in `src/sail-codecs/webp/webp.c`, `WebPDemuxGetI` with `WEBP_FF_CANVAS_WIDTH` can return a zero `image_local->width`, which is then used as a divisor when calculating `bytes_per_pixel` from the image row size. The division happens before frame decoding and before generic image skeleton validation in `src/sail/sail_advanced.c`, causing an arithmetic fault and process termination. Applications accepting untrusted WebP images can consequently suffer denial of service; builds must include the affected WebP codec. This issue is fixed in version 1.0.2."}],"affected":[{"vendor":"HappySeaFox","product":"sail","versions":[{"version":"< 1.0.2","status":"affected"}]}],"references":[{"url":"https://github.com/HappySeaFox/sail/security/advisories/GHSA-5g8g-g347-84m8","name":"https://github.com/HappySeaFox/sail/security/advisories/GHSA-5g8g-g347-84m8","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/HappySeaFox/sail/commit/495660135a4c62e416a1b357a4381dd30069229d","name":"https://github.com/HappySeaFox/sail/commit/495660135a4c62e416a1b357a4381dd30069229d","tags":["x_refsource_MISC"]},{"url":"https://github.com/HappySeaFox/sail/tree/v1.0.2","name":"https://github.com/HappySeaFox/sail/tree/v1.0.2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":4.8,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-369","lang":"en","description":"CWE-369: Divide By Zero","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-28T13:17:29.214Z"},"source":{"advisory":"GHSA-5g8g-g347-84m8","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/HappySeaFox/sail/security/advisories/GHSA-5g8g-g347-84m8","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-29T18:39:15.378792Z","id":"CVE-2026-59959","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-29T18:39:38.355Z"}}]}}}