Description
Multiple unspecified vulnerabilities in the "utf8 combining characters handling" (utf8_handle_comb function in encoding.c) in screen before 4.0.3 allows user-assisted attackers to cause a denial of service (crash or hang) via certain UTF8 sequences.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | screen | 4.0.3-0.1 | — |
| Debian 13 | screen | 4.0.3-0.1 | — |
| Debian 12 | screen | 4.0.3-0.1 | — |
| Debian 3.1 | screen | 4.0.2-4.1sarge1 | DSA-1202-1 |
Advisories 1
- DSA-1202-1 screen - programming error Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://docs.info.apple.com/article.html?artnum=305530
- ADV-2007-1939 vdb-entry
- SSA:2006-307-02 vendor-advisory
- MDKSA-2006:191 vendor-advisory
- ADV-2006-4189 vdb-entry
- DSA-1202 vendor-advisory
- APPLE-SA-2007-05-24 vendor-advisory
- USN-370-1 vendor-advisory
- 25402 third-party-advisory
- 22611 third-party-advisory
- 22573 third-party-advisory
- 22707 third-party-advisory
- [screen-users] 20061023 Secfix release for screen: screen-4.0.3 mailing-list
- 20727 vdb-entry
- https://issues.rpath.com/browse/RPL-734
- GLSA-200611-01 vendor-advisory
- OpenPKG-SA-2006.026 vendor-advisory
- 22583 third-party-advisory
- 22726 third-party-advisory
- 22647 third-party-advisory
- 22649 third-party-advisory