CVE-2026-58061 CCM-family modes write plaintext to caller buffer before tag check
Attackers can access unverified plaintext data because the library writes to the buffer before validating the authentication tag.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58061?
CVE-2026-58061 is a high-severity vulnerability in Bouncycastle Bc-Java, published on 3 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Bouncy Castle for Java before 1.85, CCM-family modes write plaintext to caller buffer before tag check. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).
Weakness: CWE-354
Which versions are affected by CVE-2026-58061?
It affects 3 products.
Products include Bouncycastle Bc-Java, Bouncycastle Bouncy Castle for Java Lts, Bouncycastle Fips Java Api.
How do I fix CVE-2026-58061?
Upgrade to a fixed version.
Is CVE-2026-58061 being exploited?
There is no known exploitation of CVE-2026-58061 in the wild and no public exploit code.
Other vulnerabilities in Bouncycastle Bc-Java
- CVE-2007-6721 Legion of the Bouncy Castle Java Cryptography API Bleichenbacher Oracle Vulnerability
- CVE-2018-1000613 Deserialization of Untrusted Data in Bouncy castle
- CVE-2026-58062 Stapled OCSP response accepted without binding to the checked certificate
- CVE-2026-59638 JSSE hostname verifier CN-fallback enabled by default despite documented opt-in
- CVE-2026-59650 MTI/A0 DH agreement exponentiates unvalidated peer value
Sources
Also known as CLEANSTART-2026-HT00159, CLEANSTART-2026-KD91593, CLEANSTART-2026-NX49206, CLEANSTART-2026-QN59512, CLEANSTART-2026-XM21821, DEBIAN-CVE-2026-58061 and 2 more.