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Fencer Intel
medium 6.1

CVE-2017-7526 json

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 lef…

published 2018-07-26 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16542

cvss
6.1
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.8%
EPSS 3.8% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

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.

Patch / fix

  • gnupg libgcrypt 1.7.8
  • gnupg1 Debian 14, Debian 13, Debian 12 1.4.22-1
  • libgcrypt20 Debian 14, Debian 13, Debian 12 1.7.8-1

debian advisories DEBIAN-CVE-2017-7526

  • gnupg Ubuntu 14.04 LTS 1.4.16-1ubuntu2.6
  • gnupg Ubuntu 16.04 LTS 1.4.20-1ubuntu3.3
  • libgcrypt11 Ubuntu 14.04 LTS 1.5.3-2ubuntu4.5
  • libgcrypt20 Ubuntu 16.04 LTS 1.6.5-2ubuntu0.3

ubuntu advisories UBUNTU-CVE-2017-7526

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • compat-libgcrypt11 SLE Module for Legacy 12 1.5.0-0.6.1
  • libgcrypt SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.6.1-16.42.1
  • libgcrypt SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 1.5.0-0.25.1

suse advisories SUSE-SU-2017:1866-1SUSE-SU-2017:1794-1SUSE-SU-2017:1793-1

  • libgcrypt openSUSE Tumbleweed 1.9.4-1.2

opensuse advisories openSUSE-SU-2024:10941-1

  • gnupg1 Alpine 3.15, Alpine 3.14, Alpine 3.13 +8 more 1.4.23-r0

alpine advisories ALPINE-CVE-2017-7526

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • grub2 Azure Linux 3.0 2.06-25

azure linux advisories AZL-41702

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • libgcrypt Arch Linux 1.7.8-1

arch linux advisories AVG-338

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-7526 updated cvss 6.1

libgcrypt: Use of left-to-right sliding window method allows full RSA key recovery

  • Red Hat Enterprise Linux 5 libgcrypt Red Hat Enterprise Linux 6 libgcrypt Red Hat Enterprise Linux 7 libgcrypt Red Hat Enterprise Virtualization 3 mingw-virt-viewer, mingw32-virt-viewer, mingw64-virt-viewer
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

3.84% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 6.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
NVD 3.0 6.8 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • GnuPG libgcrypt

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-310 Cryptographic Issues

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.