High 7.8Published Jan 29, 2021

CVE-2021-3345_gcry_md_block_write in cipher/hash-common.c in Libgcrypt version 1.9.0 has a heap-based buffer overflow when the digest final function sets a large count value.

Updated under an hour ago (Nov 2, 2026, 12:23 AM ET)

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It affects gnupg libgcrypt and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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_gcry_md_block_write in cipher/hash-common.c in Libgcrypt version 1.9.0 has a heap-based buffer overflow when the digest final function sets a large count value. It is recommended to upgrade to 1.9.1 or later.

CVSS: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

gnupg libgcrypt gnupg:libgcrypt	1.9.0	NVD
oracle communications_billing_and_revenue_management oracle:communications_billing_and_revenue_management	12.0.0.3.0	NVD

References

References

https://bugs.gentoo.org/show_bug.cgi?id=767814	issue-tracking, vendor-advisory
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=512c0c75276949f13b6373b5c04f7065af750b08
https://gnupg.org	vendor-advisory
https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000455.html	mailing-list, vendor-advisory
https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000456.html	mailing-list, patch, vendor-advisory
https://www.oracle.com//security-alerts/cpujul2021.html	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.