CVE-2026-39827Medium· 6.5▾ SunlitA flaw was found in golang.org/x/crypto/ssh. An authenticated SSH client can cause a Denial of Service (DoS) by repeatedly opening channels that are rejected by the server. This leads to unbounded memory growth, eventually crashing the ser…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 35.8 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
0.2% → 0.3%
Last analysed / modified upstream
A flaw was found in golang.org/x/crypto/ssh. An authenticated SSH client can cause a Denial of Service (DoS) by repeatedly opening channels that are rejected by the server. This leads to unbounded memory growth, eventually crashing the server process and affecting all connected users.
golang.org/x/crypto/ssh: golang: golang.org/x/crypto/ssh: Denial of Service via repeated rejected channel openings — rated Moderate by Red Hat. Released 2026-05-22, updated 2026-09-21.
Affected:
Fixed:
No fix planned:
Not affected:
Before applying this update, make sure all previously released errata relevant to your system have been applied. https://access.redhat.com/errata/RHSA-2026:43692 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:62391 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:66561
Affected packages:
golang.org/x/crypto/ssh < 0.52.0Patched in:
golang.org/x/crypto/ssh 0.52.0Connected by shared product, vendor, weakness, or advisory.
CVE-2026-39833Medium· 5.5golang.org/x/crypto/ssh/agent: golang.org/x/crypto/ssh/agent: Security bypass due to unenforced key confirmation (CVE-2026-39833)
CVE-2026-39834Medium· 6.5golang.org/x/crypto/ssh: golang: golang.org/x/crypto/ssh: Denial of Service due to integer overflow in SSH channel write (CVE-2026-39834)
CVE-2026-39823Medium· 5.4html/template: golang: Go html/template: Cross-Site Scripting via improper URL escaping in meta tag content (CVE-2026-39823)
CVE-2026-39826Medium· 5.4html/template: golang: html/template: Cross-site scripting due to incorrect script tag escaping (CVE-2026-39826)
CVE-2026-42507Medium· 5.3net/textproto: golang: Golang net/textproto: Misleading error messages via input injection (CVE-2026-42507)
CVE-2026-89473Medium· 5.5kernel: power: supply: bq25890: Fix power_supply reference leak (CVE-2026-89473)