CVE Explorer
CVE-2026-39834
When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"collectionURL":"https://pkg.go.dev","defaultStatus":"unaffected","packageName":"golang.org/x/crypto/ssh","product":"golang.org/x/crypto/ssh","programRoutines":[{"name":"channel.WriteExtended"},{"name":"Dial"},{"name":"NewClientConn"},{"name":"NewServerConn"},{"name":"Session.CombinedOutput"},{"name":"Session.Output"},{"name":"Session.Run"},{"name":"Session.Shell"},{"name":"Session.Start"},{"name":"channel.Write"},{"name":"curve25519sha256.Client"},{"name":"curve25519sha256.Server"},{"name":"dhGEXSHA.Client"},{"name":"dhGEXSHA.Server"},{"name":"dhGroup.Client"},{"name":"dhGroup.Server"},{"nam…
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:e1b9e9b7827c39056c0ece4bd7d49e84c08feef088a98bb5711cd90b4fa2cd7e · sha256:f6f0cdfe1a0bf4ab… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:e1b9e9b7827c39056c0ece4bd7d49e84c08feef088a98bb5711cd90b4fa2cd7e · sha256:f6f0cdfe1a0bf4ab… · /containers/adp/0/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"description":"CWE-190: Integer Overflow or Wraparound","lang":"en"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:e1b9e9b7827c39056c0ece4bd7d49e84c08feef088a98bb5711cd90b4fa2cd7e · sha256:f6f0cdfe1a0bf4ab… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"url":"https://go.dev/cl/781663"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e1b9e9b7827c39056c0ece4bd7d49e84c08feef088a98bb5711cd90b4fa2cd7e · sha256:f6f0cdfe1a0bf4ab… · /containers/cna/references/2
{"url":"https://go.dev/issue/79567"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e1b9e9b7827c39056c0ece4bd7d49e84c08feef088a98bb5711cd90b4fa2cd7e · sha256:f6f0cdfe1a0bf4ab… · /containers/cna/references/0
{"url":"https://groups.google.com/g/golang-announce/c/a082jnz-LvI"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e1b9e9b7827c39056c0ece4bd7d49e84c08feef088a98bb5711cd90b4fa2cd7e · sha256:f6f0cdfe1a0bf4ab… · /containers/cna/references/1
{"url":"https://pkg.go.dev/vuln/GO-2026-5020"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e1b9e9b7827c39056c0ece4bd7d49e84c08feef088a98bb5711cd90b4fa2cd7e · sha256:f6f0cdfe1a0bf4ab… · /containers/cna/references/3
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.