CVE-2026-39829
Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh
- State
- Published
- Severity
- 7.5 High
- Published
- May 22, 2026
- Updated
- Sep 18, 2026
- Reserved
- Apr 7, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
Weaknesses
- CWE-1284 Improper Validation of Specified Quantity in Input
Affected Products
| Product | Versions |
|---|---|
golang.org/x/crypto/sshgolang.org/x/crypto |
|
References
- https://go.dev/issue/79565
- https://groups.google.com/g/golang-announce/c/a082jnz-LvI
- https://go.dev/cl/781641
- https://go.dev/cl/781661
- https://pkg.go.dev/vuln/GO-2026-5018
- https://access.redhat.com/security/cve/CVE-2026-39829vdb-entry
- RHBZ#2480681issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39829.json
- https://access.redhat.com/errata/RHSA-2026:41019vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:48151vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36796vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36199vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37072vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:35833vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:49944vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:67450vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:29455vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37123vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:61314vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36808vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:51033vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:59467vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:66022vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:43692vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:46903vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:57191vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:54400vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:26546vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36319vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:26547vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36625vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36207vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36651vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:40945vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:40118vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:65126vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:60520vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36648vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:41036vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:60454vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:60446vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:60477vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:57801vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:57365vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:48693vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36820vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:52857vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:52910vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:65964vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37387vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:41031vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:42146vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:43052vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:42796vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:41066vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:40262vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:40972vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:40974vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:40969vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36797vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37271vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37268vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37272vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37278vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37286vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37296vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:57194vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:59593vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:54432vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:46885vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:47949vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:41055vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:47735vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:59559vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36883vendor-advisory
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