HighFix available
libgcrypt — security advisory
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.
- Products
- libgcrypt
- Affected versions
- Not specified
- Fixed versions
- 1.8.8-r0, 1.9.4-r0
- CVEs
- CVE-2021-33560
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:05 UTC · Revision 1
Source evidence
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.
osv:ALPINE-CVE-2021-33560
libgcrypt
Fixed versions: 1.8.8-r0
libgcrypt
Fixed versions: 1.8.8-r0
libgcrypt
Fixed versions: 1.8.8-r0
libgcrypt
Fixed versions: 1.9.4-r0
libgcrypt
Fixed versions: 1.9.4-r0
libgcrypt
Fixed versions: 1.9.4-r0
libgcrypt
Fixed versions: 1.9.4-r0
libgcrypt
Fixed versions: 1.9.4-r0
libgcrypt
Fixed versions: 1.9.4-r0
libgcrypt
Fixed versions: 1.9.4-r0
libgcrypt
Fixed versions: 1.9.4-r0
libgcrypt
Fixed versions: 1.9.4-r0
libgcrypt
Fixed versions: 1.9.4-r0
libgcrypt
Fixed versions: 1.9.4-r0
Complete source record
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"modified": "2026-10-23T17:17:56.190711573Z",
"provider": "osv",
"upstream": [
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"source_id": "core-osv",
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"published_at": "2021-06-08T11:15:07.767+00:00"
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