GHSA-qpw4-5x99-6vjp CVE-2026-39827 GO-2026-5016
golang.org/x/crypto: Invoking memory leak when rejecting channels can lead to DoS
- Severity
- 6.5 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 0.28%
- Chance of exploitation in the next 30 days. Higher than 20.46% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-924 Improper Enforcement of Message Integrity During Transmission in a Communication Channel
- Fix
0.52.0- Upgrade golang.org/x/crypto to this version or later
Description
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 released for garbage collection.
Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| golang.org/x/crypto | < 0.52.0 |
0.52.0 |
| golang.org/x/crypto | < 0.52.0 |
0.52.0 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
golang.org/x/crypto Go → 0.52.0
- go
go get golang.org/x/crypto@v0.52.0 && go mod tidy
Severity breakdown
CVSS 3.1 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-924: Improper Enforcement of Message Integrity During Transmission in a Communication Channel
The product establishes a communication channel with an endpoint and receives a message from that endpoint, but it does not sufficiently ensure that the message was not modified during transmission.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GO-2026-6355 Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh | High | Also affects golang.org/x/crypto |
| GO-2026-6354 Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh | High | Also affects golang.org/x/crypto |
| GO-2026-6303 Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh | High | Also affects golang.org/x/crypto |
| GO-2026-5932 The golang.org/x/crypto/openpgp package is unmaintained, unsafe by design, and has known security issues | Not rated yet | Also affects golang.org/x/crypto |
| GHSA-x527-x647-q7gg golang.org/x/crypto: Invoking VerifiedPublicKeyCallback permissions skip enforcement | Critical | Also affects golang.org/x/crypto |
| GHSA-w879-237q-wc7r golang.org/x/crypto: Invoking pathological RSA/DSA parameters may cause DoS | High | Also affects golang.org/x/crypto |
| GHSA-vgwf-h737-ff37 golang.org/x/crypto: Invoking client can cause server deadlock on unexpected responses | Critical | Also affects golang.org/x/crypto |
| GHSA-rm3j-f69w-wqmq golang.org/x/crypto vulnerable to infinite loop on large channel writes | Critical | Also affects golang.org/x/crypto |
Credits: Ziyan Zhou
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