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CVE-2026-123158

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround...

8.1 HighPublic exploitFix available

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.98%Scored on 2026-11-06. The trend appears after a second daily score.

What each source reports

CVE List Score used 8.1

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.

Record
CVE-2026-123158
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-394
Updated
2026-11-06
EUVDEUVD-2026-117552 8.1

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.

Record
EUVD-2026-117552
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-06
GitHub AdvisoriesGHSA-4fcc-vm97-gx3x 8.1

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround...

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.

Record
GHSA-4fcc-vm97-gx3x
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-394
Updated
2026-11-05
NVD 8.1

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.

Record
CVE-2026-123158
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-394
Updated
2026-11-06
OSVALPINE-CVE-2026-123158 8.1

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.

Record
ALPINE-CVE-2026-123158
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-06
OSVBELL-CVE-2026-123158 8.1
Record
BELL-CVE-2026-123158
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-07
OSV 8.1

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.

Record
CVE-2026-123158
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-394
Updated
2026-11-07
OSVDEBIAN-CVE-2026-123158 8.1

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.

Record
DEBIAN-CVE-2026-123158
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-06
OSVUBUNTU-CVE-2026-123158 No score

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.

Record
UBUNTU-CVE-2026-123158
Updated
2026-11-07

Affected products

Affected packages

Affected packages
PackageAffectedFixed
openssh
Alpine:v3.16
before 9.0_p1-r6
9.0_p1-r6
openssh
Alpine:v3.17
before 9.1_p1-r7
9.1_p1-r7
openssh
Alpine:v3.18
before 9.3_p2-r4
9.3_p2-r4
openssh
Alpine:v3.19
before 9.6_p1-r3
9.6_p1-r3
openssh
Alpine:v3.20
before 9.7_p1-r6
9.7_p1-r6
openssh
Alpine:v3.21
before 9.9_p2-r1
9.9_p2-r1
openssh
Alpine:v3.22
before 10.0_p1-r11
10.0_p1-r11
openssh
Alpine:v3.23
before 10.2_p1-r1
10.2_p1-r1
openssh
Alpine:v3.24
before 10.3_p1-r2
10.3_p1-r2
openssh
Alpaquita:23
9.1_p1-r3 up to 9.1_p1-r17
9.1_p1-r17
Show 33 moreShow less
Affected packages
PackageAffectedFixed
openssh
Alpaquita:25
10.0_p1-r7 up to 10.6_p2-r0
10.6_p2-r0
openssh
Alpaquita:stream
10.0_p1-r7 up to 10.6_p2-r0
10.6_p2-r0
openssh
BellSoft Hardened Containers:23
9.1_p1-r3 up to 9.1_p1-r17
9.1_p1-r17
openssh
BellSoft Hardened Containers:25
10.0_p1-r7 up to 10.6_p2-r0
10.6_p2-r0
openssh
BellSoft Hardened Containers:stream
10.0_p1-r7 up to 10.6_p2-r0
10.6_p2-r0
openssh
Debian:12
All versions, plus listed versions
1:10.0p1-11:10.0p1-21:10.0p1-31:10.0p1-41:10.0p1-5
Show 45 moreShow less
1:10.0p1-5~bpo12+21:10.0p1-61:10.0p1-71:10.0p1-7~bpo12+11:10.0p1-81:10.1p1-11:10.1p1-21:10.2p1-11:10.2p1-21:10.2p1-2~bpo13+11:10.2p1-31:10.2p1-41:10.2p1-51:10.2p1-61:10.2p1-6~bpo13+11:10.3p1-11:10.3p1-1~bpo13+11:10.3p1-21:10.3p1-31:10.3p1-41:10.3p1-51:10.3p1-71:10.3p1-81:10.3p1-91:10.4p1-11:10.4p1-21:10.4p1-31:10.4p1-41:10.4p1-51:10.5p1-11:10.6p1-11:10.6p2-11:9.2p1-21:9.2p1-2+deb12u11:9.2p1-2+deb12u101:9.2p1-2+deb12u21:9.2p1-2+deb12u31:9.2p1-2+deb12u41:9.2p1-2+deb12u51:9.2p1-2+deb12u61:9.2p1-2+deb12u71:9.2p1-2+deb12u81:9.2p1-2+deb12u91:9.3p1-11:9.3p1-1+loong64
None known
openssh
Debian:13
All versions, plus listed versions
1:10.0p1-71:10.0p1-7+deb13u11:10.0p1-7+deb13u21:10.0p1-7+deb13u31:10.0p1-7+deb13u4
Show 28 moreShow less
1:10.0p1-81:10.1p1-11:10.1p1-21:10.2p1-11:10.2p1-21:10.2p1-2~bpo13+11:10.2p1-31:10.2p1-41:10.2p1-51:10.2p1-61:10.2p1-6~bpo13+11:10.3p1-11:10.3p1-1~bpo13+11:10.3p1-21:10.3p1-31:10.3p1-41:10.3p1-51:10.3p1-71:10.3p1-81:10.3p1-91:10.4p1-11:10.4p1-21:10.4p1-31:10.4p1-41:10.4p1-51:10.5p1-11:10.6p1-11:10.6p2-1
None known
openssh
Debian:14
All versions, plus listed versions
1:10.0p1-71:10.0p1-81:10.1p1-11:10.1p1-21:10.2p1-1
Show 24 moreShow less
1:10.2p1-21:10.2p1-2~bpo13+11:10.2p1-31:10.2p1-41:10.2p1-51:10.2p1-61:10.2p1-6~bpo13+11:10.3p1-11:10.3p1-1~bpo13+11:10.3p1-21:10.3p1-31:10.3p1-41:10.3p1-51:10.3p1-71:10.3p1-81:10.3p1-91:10.4p1-11:10.4p1-21:10.4p1-31:10.4p1-41:10.4p1-51:10.5p1-11:10.6p1-11:10.6p2-1
None known
openssh-gssapi
Debian:14
All versions, plus listed versions
1:10.4p1-51:10.5p1-11:10.6p1-11:10.6p2-1
None known
openssh
Ubuntu:Pro:14.04:LTS
All versions, plus listed versions
1:6.2p2-61:6.2p2-6ubuntu11:6.4p1-11:6.4p1-21:6.5p1-1
Show 22 moreShow less
1:6.5p1-21:6.5p1-31:6.5p1-41:6.5p1-61:6.6p1-11:6.6p1-21:6.6p1-2ubuntu11:6.6p1-2ubuntu21:6.6p1-2ubuntu2.21:6.6p1-2ubuntu2.31:6.6p1-2ubuntu2.41:6.6p1-2ubuntu2.61:6.6p1-2ubuntu2.71:6.6p1-2ubuntu2.81:6.6p1-2ubuntu2.101:6.6p1-2ubuntu2.111:6.6p1-2ubuntu2.121:6.6p1-2ubuntu2.131:6.6p1-2ubuntu2.13+esm11:6.6p1-2ubuntu2.13+esm21:6.6p1-2ubuntu2.13+esm31:6.6p1-2ubuntu2.13+esm4
None known
openssh
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1:6.9p1-21:6.9p1-31:7.1p1-11:7.1p1-31:7.1p1-4
Show 27 moreShow less
1:7.1p1-61:7.1p2-11:7.1p2-21:7.2p1-11:7.2p2-11:7.2p2-21:7.2p2-31:7.2p2-41:7.2p2-4ubuntu11:7.2p2-4ubuntu2.11:7.2p2-4ubuntu2.21:7.2p2-4ubuntu2.41:7.2p2-4ubuntu2.51:7.2p2-4ubuntu2.61:7.2p2-4ubuntu2.71:7.2p2-4ubuntu2.81:7.2p2-4ubuntu2.101:7.2p2-4ubuntu2.10+esm11:7.2p2-4ubuntu2.10+esm21:7.2p2-4ubuntu2.10+esm31:7.2p2-4ubuntu2.10+esm41:7.2p2-4ubuntu2.10+esm51:7.2p2-4ubuntu2.10+esm61:7.2p2-4ubuntu2.10+esm71:7.2p2-4ubuntu2.10+esm81:7.2p2-4ubuntu2.10+esm91:7.2p2-4ubuntu2.10+esm10
None known
openssh
Ubuntu:Pro:FIPS-updates:16.04:LTS
All versions, plus listed versions
1:7.2p2-4ubuntu2.fips.2.2.31:7.2p2-4ubuntu2.fips.2.4.11:7.2p2-4ubuntu2.fips.2.4.21:7.2p2-4ubuntu2.fips.2.8.11:7.2p2-4ubuntu2.fips.2.10.1
Show 6 moreShow less
1:7.2p2-4ubuntu2.fips.2.10.21:7.2p2-4ubuntu2.fips.2.10.31:7.2p2-4ubuntu2.fips.2.10.41:7.2p2-4ubuntu2.fips.2.10.51:7.2p2-4ubuntu2.fips.2.10.61:7.2p2-4ubuntu2.fips.2.10.7
None known
openssh
Ubuntu:Pro:FIPS:16.04:LTS
All versions, plus listed versions
1:7.2p2-4ubuntu2.fips.2.21:7.2p2-4ubuntu2.fips.2.2.11:7.2p2-4ubuntu2.fips.2.10.1
None known
openssh
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
1:7.5p1-101:7.6p1-41:7.6p1-4ubuntu0.11:7.6p1-4ubuntu0.21:7.6p1-4ubuntu0.3
Show 9 moreShow less
1:7.6p1-4ubuntu0.51:7.6p1-4ubuntu0.61:7.6p1-4ubuntu0.71:7.6p1-4ubuntu0.7+esm11:7.6p1-4ubuntu0.7+esm21:7.6p1-4ubuntu0.7+esm31:7.6p1-4ubuntu0.7+esm41:7.6p1-4ubuntu0.7+esm51:7.6p1-4ubuntu0.7+esm6
None known
openssh-ssh1
Ubuntu:18.04:LTS
All versions, plus listed versions
1:7.5p1-81:7.5p1-91:7.5p1-9build11:7.5p1-10
None known
openssh
Ubuntu:Pro:FIPS-updates:18.04:LTS
All versions, plus listed versions
1:7.9p1-10~ubuntu18.04.fips.0.11:7.9p1-10~ubuntu18.04.fips.0.21:7.9p1-10~ubuntu18.04.fips.0.31:7.9p1-10~ubuntu18.04.fips.0.41:7.9p1-10~ubuntu18.04.fips.0.5
Show 5 moreShow less
1:7.9p1-10~ubuntu18.04.fips.0.61:7.9p1-10~ubuntu18.04.fips.0.71:7.9p1-10~ubuntu18.04.fips.0.81:7.9p1-10~ubuntu18.04.fips.0.91:7.9p1-10~ubuntu18.04.fips.0.10
None known
openssh
Ubuntu:Pro:FIPS:18.04:LTS
All versions, plus listed versions
1:7.9p1-10~ubuntu18.04.fips.0.11:7.9p1-10~ubuntu18.04.fips.0.2
None known
openssh
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
1:8.0p1-6build11:8.1p1-11:8.1p1-51:8.2p1-41:8.2p1-4ubuntu0.1
Show 14 moreShow less
1:8.2p1-4ubuntu0.21:8.2p1-4ubuntu0.31:8.2p1-4ubuntu0.41:8.2p1-4ubuntu0.51:8.2p1-4ubuntu0.71:8.2p1-4ubuntu0.81:8.2p1-4ubuntu0.91:8.2p1-4ubuntu0.101:8.2p1-4ubuntu0.111:8.2p1-4ubuntu0.121:8.2p1-4ubuntu0.131:8.2p1-4ubuntu0.13+esm11:8.2p1-4ubuntu0.13+esm21:8.2p1-4ubuntu0.13+esm3
None known
openssh-ssh1
Ubuntu:20.04:LTS
All versions, plus listed versions
1:7.5p1-11build1
None known
openssh
Ubuntu:Pro:FIPS-updates:20.04:LTS
All versions, plus listed versions
1:8.2p1-4ubuntu0.fips.0.2.11:8.2p1-4ubuntu0.fips.0.4.01:8.2p1-4ubuntu0.fips.0.5.01:8.2p1-4ubuntu0.fips.0.71:8.2p1-4ubuntu0.fips.0.8
Show 7 moreShow less
1:8.2p1-4ubuntu0.fips.0.91:8.2p1-4ubuntu0.fips.0.101:8.2p1-4ubuntu0.fips.0.111:8.2p1-4ubuntu0.fips.0.121:8.2p1-4ubuntu0.fips.0.131:8.2p1-4ubuntu0.fips.0.13.11:8.2p1-4ubuntu0.fips.0.13.3
None known
openssh
Ubuntu:Pro:FIPS:20.04:LTS
All versions, plus listed versions
1:8.2p1-4ubuntu0.fips.0.2.1
None known
openssh
Ubuntu:22.04:LTS
All versions, plus listed versions
1:8.4p1-6ubuntu21:8.7p1-21:8.7p1-2build11:8.7p1-41:8.8p1-1
Show 15 moreShow less
1:8.9p1-31:8.9p1-3ubuntu0.11:8.9p1-3ubuntu0.31:8.9p1-3ubuntu0.41:8.9p1-3ubuntu0.51:8.9p1-3ubuntu0.61:8.9p1-3ubuntu0.71:8.9p1-3ubuntu0.101:8.9p1-3ubuntu0.111:8.9p1-3ubuntu0.131:8.9p1-3ubuntu0.141:8.9p1-3ubuntu0.151:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.171:8.9p1-3ubuntu0.18
None known
openssh-ssh1
Ubuntu:22.04:LTS
All versions, plus listed versions
1:7.5p1-121:7.5p1-12build11:7.5p1-13
None known
openssh
Ubuntu:Pro:FIPS-preview:22.04:LTS
All versions, plus listed versions
1:8.9p1-3ubuntu0.4+Fips11:8.9p1-3ubuntu0.4+Fips31:8.9p1-3ubuntu1.fips.0~ppa3
None known
openssh
Ubuntu:Pro:FIPS-updates:22.04:LTS
All versions, plus listed versions
1:8.9p1-3ubuntu0.4+Fips11:8.9p1-3ubuntu0.4+Fips31:8.9p1-3ubuntu0.6+Fips11:8.9p1-3ubuntu0.7+Fips11:8.9p1-3ubuntu0.10+Fips1
Show 8 moreShow less
1:8.9p1-3ubuntu0.11+Fips11:8.9p1-3ubuntu0.13+Fips11:8.9p1-3ubuntu0.14+Fips11:8.9p1-3ubuntu0.15+Fips11:8.9p1-3ubuntu0.15+Fips31:8.9p1-3ubuntu0.16+Fips31:8.9p1-3ubuntu0.18+Fips11:8.9p1-3ubuntu1.fips.0~ppa3
None known
openssh
Ubuntu:24.04:LTS
All versions, plus listed versions
1:9.3p1-1ubuntu31:9.4p1-1ubuntu11:9.6p1-3ubuntu11:9.6p1-3ubuntu21:9.6p1-3ubuntu11
Show 17 moreShow less
1:9.6p1-3ubuntu121:9.6p1-3ubuntu131:9.6p1-3ubuntu13.31:9.6p1-3ubuntu13.41:9.6p1-3ubuntu13.51:9.6p1-3ubuntu13.71:9.6p1-3ubuntu13.81:9.6p1-3ubuntu13.91:9.6p1-3ubuntu13.111:9.6p1-3ubuntu13.121:9.6p1-3ubuntu13.131:9.6p1-3ubuntu13.141:9.6p1-3ubuntu13.151:9.6p1-3ubuntu13.161:9.6p1-3ubuntu13.181:9.6p1-3ubuntu13.191:9.6p1-3ubuntu13.20
None known
openssh-ssh1
Ubuntu:24.04:LTS
All versions, plus listed versions
1:7.5p1-141:7.5p1-151:7.5p1-15build11:7.5p1-16
None known
openssh
Ubuntu:Pro:FIPS-updates:24.04:LTS
All versions, plus listed versions
1:9.6p1-3ubuntu13.7+Fips11:9.6p1-3ubuntu13.12+Fips11:9.6p1-3ubuntu13.13+Fips11:9.6p1-3ubuntu13.14+Fips11:9.6p1-3ubuntu13.15+Fips1
Show 5 moreShow less
1:9.6p1-3ubuntu13.16+Fips11:9.6p1-3ubuntu13.16+Fips21:9.6p1-3ubuntu13.18+Fips11:9.6p1-3ubuntu13.19+Fips11:9.6p1-3ubuntu13.20+Fips1
None known
openssh
Ubuntu:26.10
All versions, plus listed versions
1:10.2p1-2ubuntu31:10.3p1-4ubuntu11:10.3p1-4ubuntu21:10.5p1-1ubuntu21:10.5p1-1ubuntu3.1
None known
openssh-gssapi
Ubuntu:26.10
All versions, plus listed versions
1:10.5p1-1ubuntu11:10.5p1-1ubuntu21:10.5p1-1ubuntu31:10.5p1-1ubuntu3.1
None known
openssh-ssh1
Ubuntu:26.10
All versions, plus listed versions
1:7.5p1-181:7.5p1-18ubuntu11:7.5p1-18ubuntu2
None known
openssh
Ubuntu:26.04:LTS
All versions, plus listed versions
1:10.0p1-5ubuntu51:10.2p1-2ubuntu11:10.2p1-2ubuntu31:10.2p1-2ubuntu3.21:10.2p1-2ubuntu3.4
Show 4 moreShow less
1:10.2p1-2ubuntu3.51:10.2p1-2ubuntu3.61:10.2p1-2ubuntu3.71:10.2p1-2ubuntu3.8
None known
openssh-ssh1
Ubuntu:26.04:LTS
All versions, plus listed versions
1:7.5p1-171:7.5p1-18
None known

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHub0xBlackash/CVE-2026-1231582026-11-05
PoC in GitHubThe-DevOps-Daily/alpine-sshd-check2026-11-05
PoC in GitHubcoboliqcom/cve-2026-123158-sshole-safe-rust2026-11-05
PoC in GitHubersinkoc/sshole-check2026-11-05
PoC in GitHubgabrielunknown/CVE-2026-123158_SSHole2026-11-05
PoC in GitHubrothoma2/cve-2026-123158-sshole2026-11-05
PoC in GitHubHackSpeak/CVE-2026-1231582026-11-06
PoC in GitHubHel1um17/sshole-bypass-openssh-password2026-11-06
PoC in GitHubMaalfer/CVE-2026-1231582026-11-06
PoC in GitHubakarkode/alpine-openssh-sshole-auth-bypass2026-11-06
Show 5 moreShow less
Public exploits
SourceLinkDate
PoC in GitHubansonhsu-ai/sshhole-cve-2026-123158-ste2026-11-06
PoC in GitHubmlazzarotto/ansible-sshole-remediate2026-11-06
PoC in GitHubshenxianpeng/check-sshole2026-11-06
PoC in GitHubtechdevfun/alpinegate2026-11-06
PoC in GitHubtechtaek77/sshole-guide2026-11-06

History

History
RecordedChangedSources
affected, aliases, referencesOSV
affected, aliases, referencesOSV
affected, aliases, referencesOSV
exploits, factsOSV, PoC in GitHub
affected, aliases, facts, referencesOSV
referencesCVE List, EUVD, NVD, OSV
referencesCVE List, EUVD
referencesOSV
referencesEUVD, GitHub Advisories, NVD
aliases, references, titleGitHub Advisories
Show 4 moreShow less
History
RecordedChangedSources
referencesCVE List
aliases, publishedEUVD
referencesCVE List
first indexedCVE List

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-123158 is a high vulnerability (CVSS 8.1) in Openbsd Openssh, published November 5, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.98%, the 62nd percentile. Fixed in openssh 9.0_p1-r6.

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