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    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:May 22, 2026
    Last Modified:Sep 10, 2026
    EPS:May 22, 2026
    EPSS Score:0.00467
    CVSS Score:7.5

    Affected Products

    Vendor
    Golang
    Product
    Crypto
    Vendor
    Golang
    Product
    Ssh

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-475 Signature Spoofing by Improper Validation
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2026-56855 (CVSS 7.5) — Previously, after a channel has been established, a malicious peer could send crafted messages that would dead…
    CVE-2026-78662 (CVSS 7.5) — Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer…
    CVE-2026-56854 (CVSS 7.5) — The source-address critical option in the Permissions returned by an authentication callback was only enforced…
    CVE-2026-46598 (CVSS 5.3) — For certain crafted inputs, a 'ed25519.PrivateKey' was created by casting malformed wire bytes, leading to a p…
    CVE-2026-46595 (CVSS 10) — Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other t…
    CVE-2026-42508 (CVSS 9.1) — Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the…
    CVE-2026-39834 (CVSS 9.1) — When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the interna…
    CVE-2026-39831 (CVSS 9.1) — The Verify() method for FIDO/U2F security key types ([email protected], sk-ssh-ed25519@openss…
    CVE-2026-39830 (CVSS 9.1) — A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the …
    CVE-2026-39827 (CVSS 6.5) — An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded…

    References

    https://go.dev/cl/781641
    https://go.dev/cl/781661
    https://go.dev/issue/79565
    https://groups.google.com/g/golang-announce/c/a082jnz-LvI
    https://pkg.go.dev/vuln/GO-2026-5018
    https://access.redhat.com/errata/RHSA-2026:26546
    https://access.redhat.com/errata/RHSA-2026:26547
    https://access.redhat.com/errata/RHSA-2026:29455
    https://access.redhat.com/errata/RHSA-2026:35833
    https://access.redhat.com/errata/RHSA-2026:36199
    https://access.redhat.com/errata/RHSA-2026:36207
    https://access.redhat.com/errata/RHSA-2026:36319
    https://access.redhat.com/errata/RHSA-2026:36625
    https://access.redhat.com/errata/RHSA-2026:36648
    https://access.redhat.com/errata/RHSA-2026:36651
    https://access.redhat.com/errata/RHSA-2026:36796
    https://access.redhat.com/errata/RHSA-2026:36797
    https://access.redhat.com/errata/RHSA-2026:36808
    https://access.redhat.com/errata/RHSA-2026:36820
    https://access.redhat.com/errata/RHSA-2026:36883
    https://access.redhat.com/errata/RHSA-2026:37072
    https://access.redhat.com/errata/RHSA-2026:37123
    https://access.redhat.com/errata/RHSA-2026:37268
    https://access.redhat.com/errata/RHSA-2026:37271
    https://access.redhat.com/errata/RHSA-2026:37272
    https://access.redhat.com/errata/RHSA-2026:37278
    https://access.redhat.com/errata/RHSA-2026:37286
    https://access.redhat.com/errata/RHSA-2026:37296
    https://access.redhat.com/errata/RHSA-2026:37387
    https://access.redhat.com/errata/RHSA-2026:40118
    https://access.redhat.com/errata/RHSA-2026:40262
    https://access.redhat.com/errata/RHSA-2026:40945
    https://access.redhat.com/errata/RHSA-2026:40969
    https://access.redhat.com/errata/RHSA-2026:40972
    https://access.redhat.com/errata/RHSA-2026:40974
    https://access.redhat.com/errata/RHSA-2026:41019
    https://access.redhat.com/errata/RHSA-2026:41031
    https://access.redhat.com/errata/RHSA-2026:41036
    https://access.redhat.com/errata/RHSA-2026:41055
    https://access.redhat.com/errata/RHSA-2026:41066
    https://access.redhat.com/errata/RHSA-2026:42146
    https://access.redhat.com/errata/RHSA-2026:42796
    https://access.redhat.com/errata/RHSA-2026:43052
    https://access.redhat.com/errata/RHSA-2026:43692
    https://access.redhat.com/errata/RHSA-2026:46885
    https://access.redhat.com/errata/RHSA-2026:46903
    https://access.redhat.com/errata/RHSA-2026:47735
    https://access.redhat.com/errata/RHSA-2026:47949
    https://access.redhat.com/errata/RHSA-2026:48151
    https://access.redhat.com/errata/RHSA-2026:48693
    https://access.redhat.com/errata/RHSA-2026:49944
    https://access.redhat.com/errata/RHSA-2026:51033
    https://access.redhat.com/errata/RHSA-2026:52857
    https://access.redhat.com/errata/RHSA-2026:52910
    https://access.redhat.com/errata/RHSA-2026:54400
    https://access.redhat.com/errata/RHSA-2026:54432
    https://access.redhat.com/errata/RHSA-2026:57191
    https://access.redhat.com/errata/RHSA-2026:57194
    https://access.redhat.com/errata/RHSA-2026:57365
    https://access.redhat.com/errata/RHSA-2026:57801
    https://access.redhat.com/errata/RHSA-2026:59467
    https://access.redhat.com/errata/RHSA-2026:59559
    https://access.redhat.com/errata/RHSA-2026:59593
    https://access.redhat.com/errata/RHSA-2026:60446
    https://access.redhat.com/errata/RHSA-2026:60454
    https://access.redhat.com/errata/RHSA-2026:60477
    https://access.redhat.com/errata/RHSA-2026:60520
    https://access.redhat.com/errata/RHSA-2026:61314
    https://access.redhat.com/errata/RHSA-2026:65126
    https://access.redhat.com/errata/RHSA-2026:65964
    https://access.redhat.com/security/cve/CVE-2026-39829
    https://bugzilla.redhat.com/show_bug.cgi?id=2480681
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39829.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High