CVE-2026-29795
stellar-xdr: `StringM::from_str` bypasses max length validation
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.
INFO
Published Date :
March 6, 2026, 9:16 p.m.
Last Modified :
March 18, 2026, 6:46 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update stellar-xdr library to version 25.0.1.
- Validate StringM construction in affected code.
- Test serialization and validation logic.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-29795.
| URL | Resource |
|---|---|
| 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 Tracking Patch |
| https://github.com/stellar/rs-stellar-xdr/security/advisories/GHSA-x57h-xx53-v53w | Mitigation Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-29795 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-29795
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-29795 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-29795 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 18, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:stellar:stellar-xdr:*:*:*:*:*:rust:*:* versions up to (excluding) 25.0.1 Added Reference Type GitHub, Inc.: https://github.com/stellar/rs-stellar-xdr/commit/1f840013c3e2fca0321fb844b048afa01d10dda6 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/stellar/rs-stellar-xdr/issues/499 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/stellar/rs-stellar-xdr/pull/500 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/stellar/rs-stellar-xdr/security/advisories/GHSA-x57h-xx53-v53w Types: Mitigation, Patch, Vendor Advisory -
New CVE Received by [email protected]
Mar. 06, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Added CWE CWE-770 Added Reference https://github.com/stellar/rs-stellar-xdr/commit/1f840013c3e2fca0321fb844b048afa01d10dda6 Added Reference https://github.com/stellar/rs-stellar-xdr/issues/499 Added Reference https://github.com/stellar/rs-stellar-xdr/pull/500 Added Reference https://github.com/stellar/rs-stellar-xdr/security/advisories/GHSA-x57h-xx53-v53w