Vulnerability · Published Aug 3, 2026 · Assigned by bcorg
CVE-2026-58062Stapled OCSP response accepted without binding to the checked certificate
Critical 9.3
In plain English
A critical-severity improper certificate validation in BC-FJA from Legion of the Bouncy Castle Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
In Bouncy Castle for Java before 1.85, Stapled OCSP response accepted without binding to the checked certificate. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | bouncycastle | no fix listed | DEBIAN-CVE-2026-58062 |
| Debian:13 | bouncycastle | no fix listed | DEBIAN-CVE-2026-58062 |
| Debian:14 | bouncycastle | 1.86-1 | DEBIAN-CVE-2026-58062 |
| Ubuntu:26.04:LTS | bouncycastle | no fix listed | UBUNTU-CVE-2026-58062 |
| Ubuntu:26.10 | bouncycastle | no fix listed | UBUNTU-CVE-2026-58062 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Legion of the Bouncy Castle Inc. | BC-JAVA | 1.66 – before 1.85 |
| Legion of the Bouncy Castle Inc. | BC-LTS-JAVA | 2.73.0 – before 2.73.12 |
| Legion of the Bouncy Castle Inc. | BC-FJA | 2.0.0 – before 2.0.22.1.0 – before 2.1.3 |
Weakness: CWE-295 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber