In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from…
Priority LOW 31CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- 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
In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.
Why it matters now
EPSS 0.02318 83rd 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
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Virtualization 3
Timeline
- 2026-10-02 Threatist record created from CVE-2017-9526
- 2026-10-03 Alias added: GHSA-665h-28h9-qh6v
References
Advisory 1
Other 4
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=5a22de904a0a366ae79f03ff1e13a1232a89e26b
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=f9494b3f258e01b6af8bd3941ce436bcc00afc56
More GnuPG Libgcrypt vulnerabilities
- TI-2021-12953 Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it… CVSS 3.1HIGH 7.5
- TI-2017-00354 Information disclosure in libgcrypt CVSS 3.0HIGH 7.5
- TI-2017-05168 Information disclosure in GnuPG libgcrypt CVSS 3.0MEDIUM 6.8
- TI-2021-02343 _gcry_md_block_write in cipher/hash-common.c in Libgcrypt version 1.9.0 has a heap-based… CVSS 3.1HIGH 7.8
- TI-2018-04986 cipher/elgamal.c in Libgcrypt through 1.8.2, when used to encrypt messages directly… CVSS 3.0HIGH 7.5
- TI-2019-09661 In Libgcrypt 1.8.4, the C implementation of AES is vulnerable to a flush-and-reload… CVSS 3.1MEDIUM 5.9
Sources
- CVE-2017-9526 · CVE Program
- CVE-2017-9526 · NVD
- FIRST EPSS
- GHSA-665h-28h9-qh6v · GitHub Advisory Database · CC BY 4.0
- CVE-2017-9526 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences