CVE-2026-39829: The RSA and DSA public key parsers did not enforce size limits on key parameters

Q: How do I fix CVE-2026-39829?

crypto: upgrade to 0.52.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-39829 being exploited?

CVE-2026-39829 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-2026-39829 affect?

CVE-2026-39829 affects crypto. Severity is high (CVSS 7.5). The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an excessively large modulus or DSA parameter could cause several minutes of CPU consumption during signature verification. This cou

Q: How urgent is CVE-2026-39829?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-39829 is a high-severity flaw (CVSS 7.5) affecting crypto. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an excessively large modulus or DSA parameter could cause several minutes of CPU consumption during signature verification. This could be triggered by unauthenticated clients during public key authentication. RSA moduli are now limited to 8192 bits, and DSA parameters are validated per FIPS 186-2.

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 60%)
CISA exploited list	No
Weakness	CWE-347, CWE-1284
Published	2026-05-22
Last modified	2026-09-16

Publisher (CNA): Go Project · Vendor: golang

Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-22 04:16 UTCPublished CVE record published
2026-09-16 13:17 UTCUpdated Record last modified

golang crypto UPGRADE

Affected: < 0.52.0

Fixed in: 0.52.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.52.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade crypto

Note

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

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:37123] Important: podman security, bug fix, and enhancement update 2026-07-13
AlmaLinux Errata: [ALSA-2026:29455] Important: buildah security update 2026-06-25

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-2026-39829?

crypto: upgrade to 0.52.0. Exact commands for each OS are on this page.

Is CVE-2026-39829 being exploited?

CVE-2026-39829 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-2026-39829 affect?

CVE-2026-39829 affects crypto. Severity is high (CVSS 7.5). The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an excessively large modulus or DSA parameter could cause several minutes of CPU consumption during signature verification. This cou

How urgent is CVE-2026-39829?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

Software pages

Go (Golang) vulnerabilities

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References

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