stellar rs-soroban-sdk up to 22.0.10/23.5.2/25.2.x Fr Handler modulus r comparison

Summaryinfo

A vulnerability classified as problematic was found in stellar rs-soroban-sdk up to 22.0.10/23.5.2/25.2.x. This affects an unknown function of the component Fr Handler. Such manipulation of the argument modulus r leads to comparison. This vulnerability is listed as CVE-2026-32322. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in stellar rs-soroban-sdk up to 22.0.10/23.5.2/25.2.x and classified as problematic. Affected by this issue is an unknown function of the component Fr Handler. The manipulation of the argument modulus r with an unknown input leads to a comparison vulnerability. Using CWE to declare the problem leads to CWE-697. The product compares two entities in a security-relevant context, but the comparison is incorrect, which may lead to resultant weaknesses. Impacted is integrity. CVE summarizes:

soroban-sdk is a Rust SDK for Soroban contracts. Prior to 22.0.11, 23.5.3, and 25.3.0, The Fr (scalar field) types for BN254 and BLS12-381 in soroban-sdk compared values using their raw U256 representation without first reducing modulo the field modulus r. This caused mathematically equal field elements to compare as not-equal when one or both values were unreduced (i.e., >= r). The vulnerability requires an attacker to supply crafted Fr values through contract inputs, and compare them directly without going through host-side arithmetic operations. Smart contracts that rely on Fr equality checks for security-critical logic could produce incorrect results. The impact depends on how the affected contract uses Fr equality comparisons, but can result in incorrect authorization decisions or validation bypasses in contracts that perform equality checks on user-supplied scalar values. This vulnerability is fixed in 22.0.11, 23.5.3, and 25.3.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-32322 since 03/11/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 22.0.11, 23.5.3 or 25.3.0 eliminates this vulnerability.

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Productinfo

Vendor

• stellar

Name

• rs-soroban-sdk

Version

• 22.0.0
• 22.0.1
• 22.0.2
• 22.0.3
• 22.0.4
• 22.0.5
• 22.0.6
• 22.0.7
• 22.0.8
• 22.0.9
• 22.0.10
• 23.5.0
• 23.5.1
• 23.5.2
• 25.0
• 25.1
• 25.2

Website

• Product: https://github.com/stellar/rs-soroban-sdk/

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