CVE-2026-24785: Clatter is a no_std compatible, pure Rust implementation of the Noise protocol framework with post-quantum sup

Q: How do I fix CVE-2026-24785?

clatter: upgrade to 2.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-24785 being exploited?

CVE-2026-24785 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-2026-24785 affect?

CVE-2026-24785 affects clatter. Severity is critical (CVSS 9.1). Clatter is a no_std compatible, pure Rust implementation of the Noise protocol framework with post-quantum support. Versiosn prior to2.2.0 have a protocol compliance vulnerability. The library allowed post-quantum handshake patterns that vi

Q: How urgent is CVE-2026-24785?

Priority 38/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-24785 is a critical-severity flaw (CVSS 9.1) affecting clatter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Clatter is a no_std compatible, pure Rust implementation of the Noise protocol framework with post-quantum support. Versiosn prior to2.2.0 have a protocol compliance vulnerability. The library allowed post-quantum handshake patterns that violated the PSK validity rule (Noise Protocol Framework Section 9.3). This could allow PSK-derived keys to be used for encryption without proper randomization by self-chosen ephemeral randomness, weakening secur

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-327
Published	2026-01-28
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2026-01-28 00:15 UTCPublished CVE record published
2026-06-17 10:23 UTCUpdated Record last modified

jmlepisto clatter UPGRADE

Affected: < 2.2.0

Fixed in: 2.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy clatter || rpm -q clatter || clatter --version

2. UPGRADE to 2.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade clatter

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade clatter

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-2026-24785?

clatter: upgrade to 2.2.0. Exact commands for each OS are on this page.

Is CVE-2026-24785 being exploited?

CVE-2026-24785 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-2026-24785 affect?

CVE-2026-24785 affects clatter. Severity is critical (CVSS 9.1). Clatter is a no_std compatible, pure Rust implementation of the Noise protocol framework with post-quantum support. Versiosn prior to2.2.0 have a protocol compliance vulnerability. The library allowed post-quantum handshake patterns that vi

How urgent is CVE-2026-24785?

Priority 38/100. Critical severity; Remotely exploitable, no login, no user action

References

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