{"id":"CVE-2026-24783","state":"PUBLISHED","title":"soroban-fixed-point-math has Incorrect Rounding and Overflow Handling in Signed Fixed-Point Math with Negatives","description":"soroban-fixed-point-math is a fixed-point math library for Soroban smart contacts. In versions 1.3.0 and 1.4.0, the `mulDiv(x, y, z)` function incorrectly handled cases where both the intermediate product $x * y$ and the divisor $z$ were negative. The logic assumed that if the intermediate product was negative, the final result must also be negative, neglecting the sign of $z$. This resulted in rounding being applied in the wrong direction for cases where both $x * y$ and $z$ were negative. The functions most at risk are `fixed_div_floor` and `fixed_div_ceil`, as they often use non-constant numbers as the divisor $z$ in `mulDiv`.  This error is present in all signed `FixedPoint` and `SorobanFixedPoint` implementations, including `i64`, `i128`, and `I256`. Versions 1.3.1 and 1.4.1 contain a patch. No known workarounds for this issue are available.","publishedAt":"2026-01-27T22:04:18.006Z","updatedAt":"2026-01-28T21:09:12.428Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["script3 soroban-fixed-point-math"],"affected":[{"vendor":"script3","product":"soroban-fixed-point-math","versions":[{"version":"= 1.4.0","status":"affected"},{"version":"= 1.3.0","status":"affected"}]}],"references":["https://github.com/script3/soroban-fixed-point-math/security/advisories/GHSA-x5m4-43jf-hh65","https://github.com/script3/soroban-fixed-point-math/commit/c9233f7094198a49ed66a4d75786a8a3755c936a","https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.3.1","https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.4.1"],"weaknesses":["CWE-682"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/24xxx/CVE-2026-24783.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-24783","state":"PUBLISHED","datePublished":"2026-01-27T22:04:18.006Z","dateUpdated":"2026-01-28T21:09:12.428Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-01-26T21:06:47.869Z"},"containers":{"cna":{"title":"soroban-fixed-point-math has Incorrect Rounding and Overflow Handling in Signed Fixed-Point Math with Negatives","descriptions":[{"lang":"en","value":"soroban-fixed-point-math is a fixed-point math library for Soroban smart contacts. In versions 1.3.0 and 1.4.0, the `mulDiv(x, y, z)` function incorrectly handled cases where both the intermediate product $x * y$ and the divisor $z$ were negative. The logic assumed that if the intermediate product was negative, the final result must also be negative, neglecting the sign of $z$. This resulted in rounding being applied in the wrong direction for cases where both $x * y$ and $z$ were negative. The functions most at risk are `fixed_div_floor` and `fixed_div_ceil`, as they often use non-constant numbers as the divisor $z$ in `mulDiv`.  This error is present in all signed `FixedPoint` and `SorobanFixedPoint` implementations, including `i64`, `i128`, and `I256`. Versions 1.3.1 and 1.4.1 contain a patch. No known workarounds for this issue are available."}],"affected":[{"vendor":"script3","product":"soroban-fixed-point-math","versions":[{"version":"= 1.4.0","status":"affected"},{"version":"= 1.3.0","status":"affected"}]}],"references":[{"url":"https://github.com/script3/soroban-fixed-point-math/security/advisories/GHSA-x5m4-43jf-hh65","name":"https://github.com/script3/soroban-fixed-point-math/security/advisories/GHSA-x5m4-43jf-hh65","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/script3/soroban-fixed-point-math/commit/c9233f7094198a49ed66a4d75786a8a3755c936a","name":"https://github.com/script3/soroban-fixed-point-math/commit/c9233f7094198a49ed66a4d75786a8a3755c936a","tags":["x_refsource_MISC"]},{"url":"https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.3.1","name":"https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.3.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.4.1","name":"https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.4.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-682","lang":"en","description":"CWE-682: Incorrect Calculation","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-01-27T22:04:18.006Z"},"source":{"advisory":"GHSA-x5m4-43jf-hh65","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-28T21:08:58.618891Z","id":"CVE-2026-24783","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-28T21:09:12.428Z"}}]}}}