🛡️ JLSEC-2026-123 — libgcrypt-jll
Description
Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. This, for example, affects use of ElGamal in OpenPGP.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.
Affected software
JLSEC-2026-123 is recorded against 1 package.
- libgcrypt-jll
Timeline and source
Published on 17 April 2026 and last revised on 25 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
dev.gnupg.org (Web)
dev.gnupg.org (Web)
dev.gnupg.org (Web)
dev.gnupg.org (Web)
lists.debian.org (Web)
lists.fedoraproject.org (Web)
lists.fedoraproject.org (Web)
security.gentoo.org (Web)
www.oracle.com (Web)
www.oracle.com (Web)
www.oracle.com (Web)
www.oracle.com (Web)
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| libgcrypt-jll | — | — |
References
Similar Threats
- Unknown JLSEC-2026-496
- Unknown JLSEC-2026-497
- Unknown JLSEC-2026-124
More JLSEC 2026 advisories
Browse all of JLSEC 2026 in the advisory index.
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