How severe is CVE-2026-39829?

CVE-2026-39829 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-39829 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39829?

CVE-2026-39829 affects Golang Crypto. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39829?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-39829 have an EU (EUVD) identifier?

Yes. CVE-2026-39829 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31396.

When was CVE-2026-39829 published?

CVE-2026-39829 was published on 2026-05-22 and last updated on 2026-07-08.

CVE-2026-39829

CVE-2026-39829 is a high-severity vulnerability in Golang Crypto with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31396
Weakness: CWE-347
Affected product: Golang Crypto
Published: 2026-05-22
Last modified: 2026-07-08

Description

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.

Frequently asked questions

What is CVE-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 clients during public key authentication. RSA moduli are now limited to 8192 bits, and DSA parameters are validated per FIPS 186-2.
How severe is CVE-2026-39829?: CVE-2026-39829 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-39829 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39829?: CVE-2026-39829 affects Golang Crypto. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39829?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-39829 have an EU (EUVD) identifier?: Yes. CVE-2026-39829 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31396.
When was CVE-2026-39829 published?: CVE-2026-39829 was published on 2026-05-22 and last updated on 2026-07-08.

References

Affected products (1)

cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*

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