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2.5
CVE-2026-35388PATCHED
openbsd · openssh

CVE-2026-35388: OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.

Description

OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.

Affected Products

VendorProductVersions
openbsdopenssh0

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
ibmqradar siemcert_advisory90%
open sourceopensshcert_advisory90%

References

  • https://www.openssh.org/releasenotes.html#10.3p1
  • https://marc.info/?l=openssh-unix-dev&m=177513443901484&w=2
  • https://www.openwall.com/lists/oss-security/2026/04/02/3

Related News (5 articles)

Tier B
BSI Advisories21d ago
[NEU] [hoch] IBM QRadar SIEM: Mehrere Schwachstellen
→ No new info (linked only)
Tier B
BSI Advisories70d ago
[NEU] [mittel] OpenSSH: Mehrere Schwachstellen
→ No new info (linked only)
Tier A
Microsoft MSRC70d ago
CVE-2026-35388
→ No new info (linked only)
Tier C
oss-security74d ago
Re: Announce: OpenSSH 10.3 released
→ No new info (linked only)
Tier C
VulDB75d ago
CVE-2026-35388 | OpenSSH up to 10.2 Proxy-mode Multiplexing Session unprotected alternate channel
→ No new info (linked only)
CVSS 3.12.5 LOW
VectorCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
CISA KEV❌ No
Actively exploited❌ No
Patch available
10.3
CWECWE-420
PublishedApr 2, 2026
Last enriched75d agov2
Trending Score4
Source articles5
Independent4
Info Completeness9/14
Missing: epss, kev, exploit, iocs, mitre_attack

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Related CVEs (5)

MEDIUMCVE-2026-55706
CVE-2026-55706: sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zero values f
Trending: 35
HIGHPRE-CVE
OpenBSD sppp_pap_input PAP Authentication Bypass Vulnerability
Trending: 26
HIGHCVE-2026-35385
CVE-2026-35385: In OpenSSH before 10.3, a file downloaded by scp may be installed setuid or setgid, an outcome contrary to some users' e
Trending: 6
LOWCVE-2026-35386EXP
CVE-2026-35386: In OpenSSH before 10.3, command execution can occur via shell metacharacters in a username within a command line. This r
Trending: 3
MEDIUMCVE-2026-35414EXP
CVE-2026-35414: OpenSSH before 10.3 mishandles the authorized_keys principals option in uncommon scenarios involving a principals list i
Trending: 3

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Verification

State: unverified
Confidence: 0%

Vulnerability Timeline

CVE Published
Apr 2, 2026
Discovered by ZDM
Apr 2, 2026
Updated: affectedVersions, severity
Apr 2, 2026
Patch Available
Apr 2, 2026

Version History

v2
Last enriched 75d ago
v2Tier C75d ago

Updated affected versions to include 10.2, changed severity to MEDIUM, and noted that no exploit is available.

affectedVersionsseverity
via VulDB
v175d ago

Initial creation