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01 Record

CVE-2026-78662

Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh

HighPUBLISHEDCNA: Go
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

02 Description

Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.43% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 37.1% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD analysis status
Analyzed. NVD last modified this record on 2026-09-04.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-09-02 19:37Z1 MO AGO
Last updated
2026-09-03 13:20Z1 MO AGO
Reserved
2026-08-24
Assigning CNA
Go
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses
  • CWE-770Allocation of Resources Without Limits or ThrottlingBase
  • CWE-833DeadlockBase
Data version
5.2
Document digest
0684f7664ba5cb5d880ea21172db6cac673d4e88873155024ac95494d019f7d8

05 Affected products

VendorProductVersionsPlatforms
golang.org/x/cryptogolang.org/x/crypto/ssh0 to < 0.56.0—

06 References

07 Fixed in

Debian 12

  • golang-go.crypto
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • golang-go.crypto
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • golang-go.crypto
    Fixed in 1:0.56.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • golang-defaults
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • golang-defaults
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • golang-1.20
    No fix yet
  • golang-1.21
    No fix yet
  • golang-defaults
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • golang-1.17
    No fix yet
  • golang-1.20
    No fix yet
  • golang-1.21
    No fix yet
  • golang-1.23
    No fix yet
  • golang-1.24
    No fix yet
  • golang-1.25
    No fix yet
  • golang-1.26
    No fix yet
  • golang-defaults
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • golang-1.21
    No fix yet
  • golang-1.23
    No fix yet
  • golang-1.24
    No fix yet
  • golang-1.25
    No fix yet
  • golang-1.26
    No fix yet
  • golang-defaults
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • golang-1.23
    No fix yet
  • golang-1.24
    No fix yet
  • golang-1.25
    No fix yet
  • golang-1.26
    No fix yet
  • golang-defaults
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.10

  • golang-1.26
    No fix yet
  • golang-1.27
    No fix yet
  • golang-defaults
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.