CVE-2020-26159

Name	CVE-2020-26159
Description	In Oniguruma 6.9.5_rev1, an attacker able to supply a regular expression for compilation may be able to overflow a buffer by one byte in concat_opt_exact_str in src/regcomp.c .
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
References	DLA-2431-1
NVD severity	high
Debian Bugs	972113

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libonig (PTS)	stretch	6.1.3-2	vulnerable
	stretch (security)	6.1.3-2+deb9u1	fixed
	buster	6.9.1-1	vulnerable
	bullseye, sid	6.9.5-2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libonig	source	stretch	6.1.3-2+deb9u1		DLA-2431-1
libonig	source	(unstable)	(unfixed)			972113

Notes

[buster] - libonig <no-dsa> (Minor issue)
https://github.com/kkos/oniguruma/commit/cbe9f8bd9cfc6c3c87a60fbae58fa1a85db59df0
https://github.com/kkos/oniguruma/issues/207