| Name | CVE-2021-26937 |
| Description | encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence. |
| 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-2570-1, DSA-4861-1 |
| Debian Bugs | 982435 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| screen (PTS) | buster, buster (security) | 4.6.2-3+deb10u1 | fixed |
| bullseye | 4.8.0-6 | fixed |
| bookworm | 4.9.0-4 | fixed |
| sid, trixie | 4.9.1-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html
https://www.openwall.com/lists/oss-security/2021/02/09/3
https://savannah.gnu.org/bugs/?60030
First patch applied in -4, but revised patch applied in -5 which fixed regressions