Vulnerability-Lookup

CVE-2026-24783 (GCVE-0-2026-24783)

Vulnerability from cvelistv5 – Published: 2026-01-27 22:04 – Updated: 2026-01-28 21:09

Title

soroban-fixed-point-math has Incorrect Rounding and Overflow Handling in Signed Fixed-Point Math with Negatives

Summary

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.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CWE

CWE-682 - Incorrect Calculation

Assigner

GitHub_M

References

URL

Tags

	https://github.com/script3/soroban-fixed-point-ma…	x_refsource_CONFIRM
	https://github.com/script3/soroban-fixed-point-ma…	x_refsource_MISC
	https://github.com/script3/soroban-fixed-point-ma…	x_refsource_MISC
	https://github.com/script3/soroban-fixed-point-ma…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	script3	soroban-fixed-point-math	Affected: = 1.4.0 Affected: = 1.3.0

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-24783

Vulnerability from fkie_nvd - Published: 2026-01-27 22:15 - Updated: 2026-01-27 22:15

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/script3/soroban-fixed-point-math/commit/c9233f7094198a49ed66a4d75786a8a3755c936a
	security-advisories@github.com	https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.3.1
	security-advisories@github.com	https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.4.1
	security-advisories@github.com	https://github.com/script3/soroban-fixed-point-math/security/advisories/GHSA-x5m4-43jf-hh65

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-24783",
  "lastModified": "2026-01-27T22:15:57.433",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-27T22:15:57.433",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/script3/soroban-fixed-point-math/commit/c9233f7094198a49ed66a4d75786a8a3755c936a"
    },
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      "source": "security-advisories@github.com",
      "url": "https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.3.1"
    },
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      "url": "https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.4.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/script3/soroban-fixed-point-math/security/advisories/GHSA-x5m4-43jf-hh65"
    }
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
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}

GHSA-X5M4-43JF-HH65

Vulnerability from github – Published: 2026-01-28 16:18 – Updated: 2026-01-28 16:18

Summary

soroban-fixed-point-math has Incorrect Rounding and Overflow Handling in Signed Fixed-Point Math with Negatives

Details

Impact

Incorrect rounding direction for signed mul and div operations

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.

Negative Overflow in `i64`

The mulDiv(x, y, z) function for i64 used the i128 type to handle "phantom overflows". These are overflows that occur intermediately during a calculation, like when computing the intermediate product $x * y$. When the final result of mulDiv was computed in i128, it was scaled back down to i64 before returning. While the code verified that the result did not exceed i64::MAX, it did not check against i64::MIN.

This caused negative results smaller than i64:MIN to wrap around to a large positive number instead of being caught as an overflow.

This error only exists for the FixedPoint implementation of i64.

Patches

v1.3.0 users should upgrade to patch v1.3.1
v1.4.0 users should upgrade to patch v1.4.1

All versions >=v1.4.1 contain the patch.

Workarounds

There are no known workarounds. Upgrade to the patched version.

Credits

soroban-fixed-point-math would like to thank the team at Certora for discovering and reporting the issue.

Severity ?

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "soroban-fixed-point-math"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.4.0"
            },
            {
              "fixed": "1.4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.0"
      ]
    },
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "soroban-fixed-point-math"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.3.0"
            },
            {
              "fixed": "1.3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-24783"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-682"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-28T16:18:54Z",
    "nvd_published_at": "2026-01-27T22:15:57Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\n#### Incorrect rounding direction for signed mul and div operations\n\nThe `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 $z$.\n\nThis 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`. \n\nThis error is present in all signed `FixedPoint` and `SorobanFixedPoint` implementations, including `i64`, `i128`, and `I256`.\n\n#### Negative Overflow in `i64`\n\nThe `mulDiv(x, y, z)` function for `i64` used the `i128` type to handle \"phantom overflows\". These are overflows that occur intermediately during a calculation, like when computing the intermediate product $x * y$. When the final result of `mulDiv` was computed in `i128`, it was scaled back down to `i64` before returning. While the code verified that the result did not exceed `i64::MAX`, it did not check against `i64::MIN`.\n\nThis caused negative results smaller than `i64:MIN` to wrap around to a large positive number instead of being caught as an overflow.\n\nThis error only exists for the `FixedPoint` implementation of `i64`. \n\n### Patches\n\n* v1.3.0 users should upgrade to patch v1.3.1\n* v1.4.0 users should upgrade to patch v1.4.1\n\nAll versions `\u003e=v1.4.1` contain the patch. \n\n### Workarounds\nThere are no known workarounds. Upgrade to the patched version.\n\n### Credits\n\nsoroban-fixed-point-math would like to thank the team at [Certora](https://www.certora.com/) for discovering and reporting the issue.",
  "id": "GHSA-x5m4-43jf-hh65",
  "modified": "2026-01-28T16:18:54Z",
  "published": "2026-01-28T16:18:54Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/script3/soroban-fixed-point-math/security/advisories/GHSA-x5m4-43jf-hh65"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24783"
    },
    {
      "type": "WEB",
      "url": "https://github.com/script3/soroban-fixed-point-math/commit/c9233f7094198a49ed66a4d75786a8a3755c936a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/script3/soroban-fixed-point-math"
    },
    {
      "type": "WEB",
      "url": "https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.3.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.4.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "soroban-fixed-point-math has Incorrect Rounding and Overflow Handling in Signed Fixed-Point Math with Negatives"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-24783 (GCVE-0-2026-24783)

FKIE_CVE-2026-24783

GHSA-X5M4-43JF-HH65

Impact

Incorrect rounding direction for signed mul and div operations

Negative Overflow in i64

Patches

Workarounds

Credits

Tags

Sightings

Nomenclature

Negative Overflow in `i64`