CVE-2020-26939

Name	CVE-2020-26939
Description	In Legion of the Bouncy Castle BC before 1.61 and BC-FJA before 1.0.1.2, attackers can obtain sensitive information about a private exponent because of Observable Differences in Behavior to Error Inputs. This occurs in org.bouncycastle.crypto.encodings.OAEPEncoding. Sending invalid ciphertext that decrypts to a short payload in the OAEP Decoder could result in the throwing of an early exception, potentially leaking some information about the private exponent of the RSA private key performing the encryption.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2433-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
bouncycastle (PTS)	bullseye	1.68-2	fixed
	bookworm	1.72-2	fixed
	sid, trixie	1.77-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
bouncycastle	source	stretch	1.56-1+deb9u3		DLA-2433-1
bouncycastle	source	(unstable)	1.61-1

Notes

[buster] - bouncycastle <no-dsa> (Minor issue)
https://github.com/bcgit/bc-java/wiki/CVE-2020-26939
https://github.com/bcgit/bc-java/commit/930f8b274c4f1f3a46e68b5441f1e7fadb57e8c1 (r1rv61)