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Vulnerabilities

Vulnerability · CVE-2026-39830

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop.

Published May 22, 2026 · catalog updated Sep 16, 2026 · A malicious SSH peer

Check if you run it

No confirmed exploitation is on record for CVE-2026-39830. EPSS is 0.62%. Act only if a listed version of A malicious SSH peer is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A malicious SSH peer).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.62%
Remediation
Fix linked
Affected products
cpe golang/crypto

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe golang/cryptoversion unspecified

How to fix CVE-2026-39830

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-39830. EPSS is 0.62%. Act only if a listed version of A malicious SSH peer is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-119: Buffer Overflow; CWE-772: Missing Release of Resource after Effective Lifetime. EPSS 0.62%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Related Odoo Git fixes

Quoted Community commit messages that cite this CVE. Presence of a commit is not proof that every edition or backport includes the fix. Enterprise proprietary diffs are never shown here. Timeline

  • May 22, 2026 · referenced

    vendor: golang.org/x/crypto v0.52.0

    vendor: golang.org/x/crypto v0.52.0 changes: - ssh: fix deadlock on unexpected channel responses (CVE-2026-39830) - ssh: fix source-address critical option bypass (CVE-2026-46595) - ssh: fix incorrect operator order (CVE-2026-46597) - ssh: fix infinite loop on large channel writes due to integer overflow (CVE-2026-39834) - ssh: enforce user presence verification for security keys (CVE-2026-39831) - ssh: enforce strict limits on DSA key parameters (CVE-2026-39829) - ssh: reject RSA keys with excessively large moduli (CVE-2026-39829) - ssh: fix panic when authority callbacks are nil (CVE-2026-39835) - ssh: fix deadlock on unexpected global responses (CVE-2026-39830) - ssh: enforce nil Permissions when returning PartialSuccessError (CVE-2026-39828) - ssh: prevent memory leak when rejecting channels (CVE-2026-3982) - ssh/knownhosts: respect Revoked CA keys (CVE-2026-42508) - ssh/agent: pr…
    https://github.com/moby/moby/commit/ce6db0fd2c60469e954b9916d67896c8145ec2a5

Timeline

Detection, updates, and resolution for this record.

  1. May 22, 2026 · NIST NVD

    Detected

    A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.

  2. Sep 16, 2026 · NIST NVD

    Updated

    A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.

Sources

  • CVE.orgVulnerability recordCVE-2026-39830

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-39830

    30-day exploitation probability 0.6%

    first.org
  • NIST NVDVulnerability recordCVE-2026-39830

    A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.