CVE-2025-29072: An integer overflow in Nethermind Juno before v.12.05 within the Sierra bytecode decompression logic within th

Q: How do I fix CVE-2025-29072?

juno: upgrade to 0.12.5. Exact commands for each OS are on this page.

Q: Is CVE-2025-29072 being exploited?

CVE-2025-29072 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-2025-29072 affect?

CVE-2025-29072 affects juno. Severity is high (CVSS 7.5). An integer overflow in Nethermind Juno before v.12.05 within the Sierra bytecode decompression logic within the "cairo-lang-starknet-classes" library could allow remote attackers to trigger an infinite loop (and high CPU usage) by submittin

Q: How urgent is CVE-2025-29072?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2025-29072 is a high-severity flaw (CVSS 7.5) affecting juno. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An integer overflow in Nethermind Juno before v.12.05 within the Sierra bytecode decompression logic within the "cairo-lang-starknet-classes" library could allow remote attackers to trigger an infinite loop (and high CPU usage) by submitting a malicious Declare v2/v3 transaction. This results in a denial-of-service condition for affected Starknet full-node implementations.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-190
Published	2025-03-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nethermind

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

Am I affected?

Timeline

2025-03-27 16:15 UTCPublished CVE record published
2026-06-17 09:05 UTCUpdated Record last modified

nethermind juno UPGRADE

Affected: < 0.12.5

Fixed in: 0.12.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.12.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade juno

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-2025-29072?

juno: upgrade to 0.12.5. Exact commands for each OS are on this page.

Is CVE-2025-29072 being exploited?

CVE-2025-29072 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-2025-29072 affect?

CVE-2025-29072 affects juno. Severity is high (CVSS 7.5). An integer overflow in Nethermind Juno before v.12.05 within the Sierra bytecode decompression logic within the "cairo-lang-starknet-classes" library could allow remote attackers to trigger an infinite loop (and high CPU usage) by submittin

How urgent is CVE-2025-29072?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

References

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