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Vulnerability record · CVE-2026-29795 · published 6 March 2026

CVE-2026-29795: Stellar-xdr allocation without limits vulnerability

Stellar · Stellar Xdr

stellar-xdr is a library and CLI containing types and functionality for working with Stellar XDR. Prior to version 25.0.1, StringM::from_str does not validate that the input length is within the declared maximum (MAX). Calling StringM::<N>::from_str(s) where s is longer than N bytes succeeds and returns an Ok value instead of Err(Error::LengthExceedsMax), producing a StringM that violates its length invariant. This affects any code that constructs StringM values from string input using FromStr (including str::parse), and relies on the type's maximum length constraint being enforced. An oversized StringM could propagate through serialization, validation, or other logic that assumes the invariant holds. This issue has been patched in version 25.0.1.

7.5 CVSS 3.1 High EPSS 0.34% · top 75.1% CWE-770 · Allocation without limits
7.5CVSS 3.1 base score
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

stellar-xdr is a library and CLI containing types and functionality for working with Stellar XDR. Prior to version 25.0.1, StringM::from_str does not validate that the input length is within the declared maximum (MAX). Calling StringM::<N>::from_str(s) where s is longer than N bytes succeeds and returns an Ok value instead of Err(Error::LengthExceedsMax), producing a StringM that violates its length invariant. This affects any code that constructs StringM values from string input using FromStr (including str::parse), and relies on the type's maximum length constraint being enforced. An oversized StringM could propagate through serialization, validation, or other logic that assumes the invariant holds. This issue has been patched in version 25.0.1.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/stellar/rs-stellar-xdr/commit/1f840013c3e2fca0321fb844b048afa01d10dda6 Patch
https://github.com/stellar/rs-stellar-xdr/issues/499 Issue Tracking
https://github.com/stellar/rs-stellar-xdr/pull/500 Issue TrackingPatch
https://github.com/stellar/rs-stellar-xdr/security/advisories/GHSA-x57h-xx53-v53w MitigationPatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-29795), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.