LibreSSL before 2.6.5 and 2.7.x before 2.7.4 allows a memory-cache side-channel attack on…
Priority LOW 21CWE-200Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-200.
Summary
LibreSSL before 2.6.5 and 2.7.x before 2.7.4 allows a memory-cache side-channel attack on DSA and ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover a key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.
Why it matters now
EPSS 0.00316 24th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openbsd:libressl:*:*:*:*:*:*:*:* | before 2.6.5 | Vulnerable | OpenBSD |
| cpe:2.3:a:openbsd:libressl:2.7.0:*:*:*:*:*:*:* | 2.7.0 | Vulnerable | OpenBSD |
| cpe:2.3:a:openbsd:libressl:2.7.1:*:*:*:*:*:*:* | 2.7.1 | Vulnerable | OpenBSD |
| cpe:2.3:a:openbsd:libressl:2.7.2:*:*:*:*:*:*:* | 2.7.2 | Vulnerable | OpenBSD |
| cpe:2.3:a:openbsd:libressl:2.7.3:*:*:*:*:*:*:* | 2.7.3 | Vulnerable | OpenBSD |
- cpe:2.3:a:openbsd:libressl:*:*:*:*:*:*:*:* Versions before 2.6.5 Vulnerable ·OpenBSD
- cpe:2.3:a:openbsd:libressl:2.7.0:*:*:*:*:*:*:* Versions 2.7.0 Vulnerable ·OpenBSD
- cpe:2.3:a:openbsd:libressl:2.7.1:*:*:*:*:*:*:* Versions 2.7.1 Vulnerable ·OpenBSD
- cpe:2.3:a:openbsd:libressl:2.7.2:*:*:*:*:*:*:* Versions 2.7.2 Vulnerable ·OpenBSD
- cpe:2.3:a:openbsd:libressl:2.7.3:*:*:*:*:*:*:* Versions 2.7.3 Vulnerable ·OpenBSD
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-12434
- 2026-10-03 Alias added: GHSA-35v2-vq8r-rrr8
References
More OpenBSD Libressl vulnerabilities
- TI-2023-17874 A double free or use after free could occur after SSL_clear in OpenBSD 7.2 before errata… CVSS 3.1CRITICAL 9.8
- TI-2021-21548 x509/x509_verify.c in LibreSSL before 3.4.2, and OpenBSD before 7.0 errata 006, allows… CVSS 3.1CRITICAL 9.8
- TI-2015-04488 Out-of-bounds write in LibreSSL CVSS 3.1CRITICAL 9.8
- TI-2015-04487 Uncontrolled resource consumption in LibreSSL CVSS 3.1HIGH 7.5
- TI-2014-07651 Double free vulnerability in the ssl_parse_clienthello_use_srtp_ext function in d1_srtp.c… CVSS 2.0HIGH 7.5
- TI-2018-06502 The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0… CVSS 3.0HIGH 7.4
Sources
- CVE-2018-12434 · CVE Program
- CVE-2018-12434 · NVD
- FIRST EPSS
- GHSA-35v2-vq8r-rrr8 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences