CVE-2016-1000340 The Bouncy Castle JCE Provider carry a propagation bug
A carry propagation bug in Bouncy Castle's elliptic curve math could cause rare spurious calculation errors, though output validation mitigated most risks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-1000340?
CVE-2016-1000340 is a high-severity vulnerability in Bouncycastle Bc-Java, published on 4 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Bouncy Castle JCE Provider versions 1.51 to 1.55, a carry propagation bug was introduced in the implementation of squaring for several raw math classes have been fixed (org.bouncycastle.math.raw.Nat???). These classes are used by our custom elliptic curve implementations (org.bouncycastle.math.ec.custom.**), so there was the possibility of rare (in general usage) spurious calculations for elliptic curve scalar multiplications. Such errors would have been detected with high probability by the output validation for our scalar multipliers.
Weakness: CWE-19
Which versions are affected by CVE-2016-1000340?
6 open source packages ship an affected version, including org.bouncycastle:bcprov-jdk14, org.bouncycastle:bcprov-jdk15 and org.bouncycastle:bcprov-jdk15on. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.bouncycastle:bcprov-jdk14 Maven | From 1.51 | 1.56 |
org.bouncycastle:bcprov-jdk14 Maven | From 1.51 | 1.56 |
org.bouncycastle:bcprov-jdk15 Maven | From 1.51 | 1.56 |
org.bouncycastle:bcprov-jdk15 Maven | From 1.51 | 1.56 |
org.bouncycastle:bcprov-jdk15on Maven | From 1.51 | 1.56 |
org.bouncycastle:bcprov-jdk15on Maven | From 1.51 | 1.56 |
Products include Bouncycastle Bc-Java.
How do I fix CVE-2016-1000340?
Upgrade org.bouncycastle:bcprov-jdk14 to 1.56 or later.
Is CVE-2016-1000340 being exploited?
There is no known exploitation of CVE-2016-1000340 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 DEBIAN-CVE-2016-1000340, GHSA-r97x-3g8f-gx3m, UBUNTU-CVE-2016-1000340.