CVE-2026-29795: stellar-xdr is a library and CLI containing types and functionality for working with Stellar XDR

Q: How do I fix CVE-2026-29795?

stellar-xdr: upgrade to 25.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-29795 being exploited?

CVE-2026-29795 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-29795 affect?

CVE-2026-29795 affects stellar-xdr. Severity is medium (CVSS 4.0). 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:: :

Routine

MEDIUM 4.0UPGRADE

CVE-2026-29795 is a medium-severity flaw (CVSS 4.0) affecting stellar-xdr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 construct

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.0 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-03-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: stellar

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-06 21:16 UTCPublished CVE record published
2026-06-17 10:29 UTCUpdated Record last modified

stellar stellar-xdr UPGRADE

Affected: < 25.0.1

Fixed in: 25.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy stellar-xdr || rpm -q stellar-xdr || stellar-xdr --version

2. UPGRADE to 25.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade stellar-xdr

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade stellar-xdr

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-29795?

stellar-xdr: upgrade to 25.0.1. Exact commands for each OS are on this page.

Is CVE-2026-29795 being exploited?

CVE-2026-29795 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-29795 affect?

CVE-2026-29795 affects stellar-xdr. Severity is medium (CVSS 4.0). 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>:

How urgent is CVE-2026-29795?

Priority 17/100. No elevated risk signals yet.

References

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