Vulnerability in Golang Crypto
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.002
Affected products
Weakness classification (CWE)
References
- go.dev/issue/79565 (Issue Tracking)
- groups.google.com/g/golang-announce/c/a082jnz-LvI (Mailing List)
- go.dev/cl/781641 (Issue Tracking)
- go.dev/cl/781661 (Issue Tracking)
- pkg.go.dev/vuln/GO-2026-5018 (Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-39829?
- CVE-2026-39829 is a high-severity vulnerability in Golang Crypto, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-05-22.
- How severe is CVE-2026-39829?
- High severity. CVSS v3 base score is 7.5 out of 10.