CVE-2026-39827
Golang Crypto ≤ 0.52.0
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HSummary
CVE-2026-39827 is a medium-severity Improper Enforcement of Message Integrity During Transmission in a Communication Channel (CWE-924) vulnerability in Golang Crypto. Its CVSS base score is 6.5 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Adversary-in-the-Middle (T1557); ranked at the 20th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SC-8 (Transmission Confidentiality and Integrity) and SC-16 (Transmission of Security and Privacy Attributes) — see the control section below for these in your framework.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-31392
Vulnerability Data
An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and…
more
released for garbage collection.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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- 6 hardening rules · 1 OS baseline
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Mitigating Controls (NIST 800-53 r5) AI
Requires protection of integrity for transmitted information, directly stopping the failure to verify messages were unmodified in transit.
Associates integrity-related security attributes with exchanged information, helping ensure modification can be detected during transmission.
Protects session authenticity, which structurally reduces the ability to undetectably modify messages in the channel.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Directly requires integrity protection (e.g., signatures/hashes) for data-in-transit, which prevents the described weakness while also addressing confidentiality/availability.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Mandates network security controls that can enforce message integrity on channels.
Addresses security of network services, which may include integrity mechanisms.
Cryptography is the primary technical means to enforce message integrity during transmission.
Requires secure information transfer procedures that can include integrity checks.
Application security requirements can specify integrity protection for transmitted messages.
Hardening callouts derived
Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).
Oracle Linux 8 (4 rules)
- V-248574 YUM must be configured to prevent the installation of patches, service packs, device drivers, or OL 8 system components that have not been digitally signed using a certificate that is recognized and approved by the organization. prevents CWE-924
- V-248823 OL 8 must not have the telnet-server package installed. prevents CWE-924
- V-248827 OL 8 must not have the rsh-server package installed. prevents CWE-924