Vulnerability · CVE-2026-39829
The RSA and DSA public key parsers did not enforce size limits on key parameters.
Published May 22, 2026 · catalog updated Sep 16, 2026 · The RSA and DSA
Check if you run it
No confirmed exploitation is on record for CVE-2026-39829. EPSS is 0.62%. Act only if a listed version of The RSA and DSA is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (The RSA and DSA).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.62%
- Remediation
- Advisory link
- Affected products
- cpe golang/crypto
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe golang/cryptoversion unspecified
How to fix CVE-2026-39829
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-39829. EPSS is 0.62%. Act only if a listed version of The RSA and DSA is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-1284; CWE-347: Improper Verification of Cryptographic Signature. EPSS 0.62%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
May 22, 2026 · NIST NVD
Detected
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
Sep 16, 2026 · NIST NVD
Updated
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
Sources
- CVE.orgVulnerability recordCVE-2026-39829
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-39829
30-day exploitation probability 0.6%
first.org - NIST NVDVulnerability recordCVE-2026-39829
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 clien
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.