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CVE

CVE-2026-39834

golang.org/x/crypto vulnerable to infinite loop on large channel writes
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CVE

CVE-2026-39834

golang.org/x/crypto vulnerable to infinite loop on large channel writes

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.

Package Versions Affected

Package Version
patch Availability
No items found.

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Related Resources

No items found.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-39834, https://cs.opensource.google/go/x/crypto, https://go.dev/cl/781663, https://go.dev/issue/79567, https://groups.google.com/g/golang-announce/c/a082jnz-LvI, https://pkg.go.dev/vuln/GO-2026-5020

Severity

9.1

CVSS Score
0
10

Basic Information

Base CVSS
9.1
EPSS Probability
0.00525%
EPSS Percentile
0.42259%
Introduced Version
0,v0.0.0-20120904234702-552202b8e32b,v0.1.0
Fix Available
0.52.0,v0.0.0-20260522000323-e05287398761,v0.52.0,0.4.12-r53,0.2.88-r6,0,9.2.7-r11,9.2.7-r10,3.3.4515.0-r2,3.3.4515.0-r3,1.2.14-r2,0.2.280-r0,3.1.16-r3,3.4.2-r4,3.1.16-r1,3.2.12-r5,1.9.10-r24,1.9.10-r17,3.6.19-r7,3.6.19-r9,1.2.1-r2,1.2.1-r1,0.43.0-r4,0.43.0-r6,10.0.4-r3,7.0.8-r0,8.1.4-r2,9.0.3-r4,1.44.0-r0,0.30.0-r2,0.30.0-r3,2.11.3-r2,2.11.3-r3,3.30.7-r8,1.20.2-r7,0.2.266-r1,1.98.7-r1,2.70.4-r2,1.11.5-r5,1.17.16-r2,1.18.10-r2,1.19.4-r2,0.19.4-r0,2.6.43-r5,1.31.9-r16,9.0.8-r25,9.1.10-r15,9.3.4-r8,9.4.1-r4,9.0.8-r28,9.3.4-r7,2026.5.2-r1,2026.5.0-r2,1.24.1-r3,1.24.1-r2,2.32.4-r3,2.1.19-r0,11.6.16-r0,12.2.10-r0,12.3.8-r0,12.4.5-r0,1.20.6-r19,1.21.5-r17,1.22.7-r5,1.20.6-r20,1.21.5-r18,1.22.7-r3,1.7.32-r2,2.3.1-r1,2.2.4-r1,3.0.6-r5,3.0.6-r4,2.0.8-r5,0.58.0-r7,0.58.0-r5,2.5.0-r9,2.5.0-r8,2.5.0-r3,2.5.0-r5,2.5.0-r4,2.5.0-r6,2.5.0-r11,2.5.0-r12,2.5.0-r13,2.5.0-r2,2.5.0-r10,2.6.0-r0,2.5.0-r7,2.19.0-r7,2.19.0-r4,0.20.8-r7,1.1.0-r1,1.2.0-r0,7.71.2-r17,28.5.2-r26,29.5.2-r3,0.34.1-r3,0.34.1-r2,5.1.4-r3,5.1.4-r2,28.5.2-r15,29.5.2-r2,0.1.16-r4,3.3.0-r4,0.227.0-r2,9.2.8-r10,9.3.4-r5,9.4.1-r2,3.4.45-r0,0.21.0-r7,2.0.1-r12,2.1.0-r12,2.2.0-r12,2.3.0-r10,2.4.1-r7,1.1.1-r4,2.1.0-r11,2.3.0-r8,2.4.1-r5,0.13.0-r3,2.5.1-r22,2.8.8-r2,2.6.4-r23,2.7.5-r20,1.1.4-r3,1.1.4-r2,1.8.5-r3,1.8.5-r4,1.8.4-r4,1.8.4-r5,0.47.0-r3,1.8.5-r2,1.12.3-r2,1.12.3-r1,0.3.6-r9,1.8.6-r1,3.20.1-r13,3.20.1-r14,5.36.0-r2,2.93.0-r0,1.26.2-r2,1.26.2-r3,18.10.7-r1,18.11.4-r1,19.0.0-r1,18.6.8-r1,19.0.1-r1,18.1.6-r11,18.10.7-r0,18.5.7-r0,18.8.11-r1,18.11.4-r0,18.8.10-r1,18.9.8-r1,18.10.1-r11,18.11.3-r4,18.10.1-r12,18.11.3-r7,18.4.6-r5,18.5.6-r1,1.100.0-r2,0_git20260522-r2,5.1.0-r6,20251030.02-r16,0_git20260523-r1,0.9.9-r267,12.1.10.01-r16,12.1.10.01-r6,0.112.0-r6,0.53.3-r5,1.1.0-r15,2.12.4-r43,2.12.4-r40,1.65.0-r2,3.21.0-r3,1.5.2-r2,1.26.8-r4,1.27.9-r2,2.104.1-r2,1.2.5-r14,1.36.1.1-r0,1.32.13.1-r19,1.33.12.1-r3,1.34.6.1-r11,1.35.5.1-r0,0.4.33-r4,0.50.18-r28,0.50.18-r21,0.2.14-r5,1.10.4-r3,2.17.3-r4,0.16.0-r1,1.19.8-r10,1.20.3-r5,1.20.3-r4,1.20.3-r7,1.20.3-r9,0.18.1-r17,1.130.4-r4,4.5.1-r5,1.3.4-r6,1.35.8-r0,2.6.0-r38,1.32.13-r1,1.33.12-r1,1.34.8-r1,1.35.5-r1,1.36.1-r1,7.14.0-r8,1.32.13-r2,3.4.1-r12,4.0.8-r6,4.0.8-r8,1.10.8-r10,0.15.8-r2,0.16.8-r1,0.17.3-r2,0.17.3-r1,2.10.8-r15,1.15.3-r20,1.18.1-r3,1.14.5-r12,1.15.20-r6,1.17.2-r6,1.1-r49,0.6.0-r8,2.16.4-r2,2.9.17-r7,3.4.6-r14,3.6.11-r1,3.7.2-r2,1.11.2-r5,1.11.2-r2,0.0.0_git20260426-r6,0.0.0_git20260426-r5,11.1.3-r3,11.4.5-r10,11.1.3-r5,11.2.4-r4,11.4.5-r6,0.50.8-r2,0.20260520.234452-r2,0.20260520.234452-r1,1.8.1-r13,2.7.3-r6,2.3.1-r3,0_git20260429-r2,0_git20260429-r4,2.46.3-r6,3.8.0-r9,0.24.0-r2,1.8.2-r1,2.5.4-r1,0.152.1-r2,1.10.10-r1,1.11.8-r2,1.8.11-r12,1.10.10-r2,1.11.8-r1,1.8.11-r16,2.3.8-r5,1.15.3-r8,1.15.3-r7,0.36.18-r5,5.8.2-r5,5.8.2-r3,0.15.1-r8,0.15.1-r6,2.51.2-r56,3.8.1-r4,3.9.1-r7,1.10.0-r9,0.51.0-r2,0.37.0-r33,0.91.0-r3,1.21.0-r9,3.243.0-r1,2.7.0-r8,3.106.2-r4,1.28.0-r2,1.35.0-r2,2.10.11-r14,2.11.13-r5,2.13.6-r1,2.14.1-r3,2.11.13-r3,2.9.12-r12,0.15.0.143-r2,3.7.3-r2,0.1.6-r14,0.18.1-r15,3.0.1-r1,5.5.0-r7,0.37.0-r2,4.30-r0,2.21.0-r3,2.21.0-r2,2.7.1-r18,1.1304.3-r4,3.13.1-r1,3.13.1-r2,1.15.0-r2,0.153.0-r0,0.152.0-r1,7.3.0-r2,2.4.4-r2,0.30.2-r9,0.30.2-r8,0.10.2-r14,0.10.2-r7,0.17.0-r4,1.44.0-r7,1.44.0-r6,0.26.3-r4,0.26.3-r3,0.68.1-r20,0.68.1-r22,1.36.4-r9,1.37.3-r14,1.38.4-r4,17.7.24-r1,18.8.2-r2,18.6.8-r17,16.5.18-r17,17.7.23-r4,1.14.9-r6,1.15.5-r0,1.14.9-r5,2.48.1-r3,6.46.0-r2,2.10.0-r2,4.74.0-r2,4.3.0-r2,1.0.5-r2,0.62.1-r2,1.28.15-r34,0.45.0-r2,0.45.0-r1,2.11.47-r0,3.6.17-r2,3.7.1-r2,3.6.17-r3,3.7.1-r4,0.70.0-r3,0.69.3-r12,0.30.1-r13,0.30.1-r10,3.95.3-r1,0.0.49-r0,0.130.0-r0,1.16.3-r40,1.21.4-r12,2.0.1-r2,0.4.0-r18,1.21.4-r16,22.0.4-r12,3.0.8-r16,0.11.0-r6,0.39.17-r2,0.77.0-r0,0.76.0-r4,4.15.0-r4,2.1.17-r3

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