What is CVE-2017-7526?

CVE-2017-7526 is a medium-severity vulnerability in Gnupg Libgcrypt, classified under Information Disclosure. CVSS score: 6.1/10. Published 2018-07-26.

How severe is CVE-2017-7526?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2017-7526 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in Gnupg Libgcrypt

CVE-2017-7526

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.

Vulnerability class: Information Disclosure

Published 2018-07-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.038 (90.1th percentile), scored 2026-10-22.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.039 · newest: 0.038 · change: -0.001

Affected products

Gnupg Libgcrypt — versions 1.7.8
Canonical Ubuntu Linux — versions 12.04, 14.04, 16.04
Debian Linux — versions 8.0, 9.0

Weakness classification (CWE)

Public proof-of-concept exploits

garethr/findcve

References

usn.ubuntu.com/3733-1/ (vendor-advisory, Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
www.securitytracker.com/id/1038915 (VDB Entry, Third Party Advisory, vdb-entry)
www.debian.org/security/2017/dsa-3960 (vendor-advisory, Third Party Advisory)
git.gnupg.org/cgi-bin/gitweb.cgi
www.debian.org/security/2017/dsa-3901 (vendor-advisory, Third Party Advisory)
usn.ubuntu.com/3733-2/ (vendor-advisory, Third Party Advisory)
eprint.iacr.org/2017/627 (Third Party Advisory)
www.securityfocus.com/bid/99338 (VDB Entry, Third Party Advisory, vdb-entry)
lists.gnupg.org/pipermail/gnupg-announce/2017q2/000408.html (Vendor Advisory, mailing-list, Mailing List)

Frequently asked questions

What is CVE-2017-7526?: CVE-2017-7526 is a medium-severity vulnerability in Gnupg Libgcrypt, classified under Information Disclosure. CVSS score: 6.1/10. Published 2018-07-26.
How severe is CVE-2017-7526?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2017-7526 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.