| Name | CVE-2019-6293 |
| Description | An issue was discovered in the function mark_beginning_as_normal in nfa.c in flex 2.6.4. There is a stack exhaustion problem caused by the mark_beginning_as_normal function making recursive calls to itself in certain scenarios involving lots of '*' characters. Remote attackers could leverage this vulnerability to cause a denial-of-service. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 919428 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| flex (PTS) | jessie, jessie (lts) | 2.5.39-8+deb8u2 | vulnerable |
| stretch | 2.6.1-1.3 | vulnerable |
| buster | 2.6.4-6.2 | vulnerable |
| bullseye | 2.6.4-8 | vulnerable |
| sid, trixie, bookworm | 2.6.4-8.2 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| flex | source | (unstable) | (unfixed) | unimportant | | 919428 |
Notes
https://github.com/westes/flex/issues/414
Negligible security impact
[wheezy] - flex <ignored> (Minor issue)