CVE-2026-35387: openbsd openssh
CVSS: 6.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-35387DEBIAN-CVE-2026-35387
Published 02-04-2026Last modified 03-04-2026
Vulnerability summary
CVE-2026-35387 is a medium (CVSS 6.5) vulnerability in openbsd openssh. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.1% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
0.50%
0%100%
Low · +0.26 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 14 · Related 2Timeline
- 02-04-2026PublishedVulnerability first disclosed.
- 03-04-2026Last modifiedVulnerability information updated.
Description
OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:NSources4 sources · 3.1–6.5
- CVE.orgCNA3.1LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:NDiffers
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
EPSS trend
Probability
0.50%
Chance of exploitation in the next 30 days
Percentile
41%
Versus all other CVEs
30-day change
+0.26 pp
From 0.24% on 19-09-2026
19-09-202619-10-2026
EPSS score0.50%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu2 products
- openssh< 1:6.6p1-2ubuntu2.13+esm4 | < 1:7.2p2-4ubuntu2.10+esm10 | All versions (No fix recorded) | < 1:7.6p1-4ubuntu0.7+esm6 | < 1:8.2p1-4ubuntu0.13+esm3 | < 1:8.9p1-3ubuntu0.15 | < 1:8.9p1-3ubuntu0.15+Fips1 | < 1:9.6p1-3ubuntu13.16 | < 1:9.6p1-3ubuntu13.16+Fips1 | < 1:10.0p1-5ubuntu5.4 | < 1:10.2p1-2ubuntu3.2
- openssh-ssh1All versions (No fix recorded)
Debian1 product
- openssh< 1:9.2p1-2+deb12u10 | < 1:10.0p1-7+deb13u3 | < 1:10.3p1-1
Openbsd1 product
- openssh< 10.3
3 vendors · 4 products
References
9 links- marc.info?l=openssh-unix-dev&m=177513443901484&w=2Third Party Advisory
- www.openwall.com/lists/oss-security/2026/04/02/3Third Party Advisory
