Information disclosure in GnuPG libgcrypt
Priority LOW 37CWE-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
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-200.
Summary
libgcrypt before version 1.7.8 is vulnerable to a cache side-channel attack resulting into a complete break of RSA-1024 while using the left-to-right method for computing the sliding-window expansion. The same attack is believed to work on RSA-2048 with moderately more computation. This side-channel requires that attacker can run arbitrary software on the hardware where the private RSA key is used.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03835 90th percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| GnuPG | libgcrypt | 1.7.8 | — | No fix listed | CNA |
- libgcrypt VendorGnuPG Affected 1.7.8 Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:* | before 1.7.8 | Vulnerable | GnuPG |
| cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:* | 12.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* | 14.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
- cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:* Versions before 1.7.8 Vulnerable ·GnuPG
- cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:* Versions 12.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Virtualization 3 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2017-7526
- 2026-10-03 Alias added: GHSA-f2v5-c455-qhg2
- 2026-10-20 EPSS moved to the 90th–95th percentile
References
Advisory 6
Other 3
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=78130828e9a140a9de4dafadbc844dbb64cb709a
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=e6a3dc9900433bbc8ad362a595a3837318c28fa9
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=8725c99ffa41778f382ca97233183bcd687bb0ce
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-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
- TI-2017-06932 In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from… CVSS 3.0MEDIUM 5.9
Sources
- CVE-2017-7526 · CVE Program
- CVE-2017-7526 · NVD
- FIRST EPSS
- GHSA-f2v5-c455-qhg2 · GitHub Advisory Database · CC BY 4.0
- CVE-2017-7526 · 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