Description
Yaws before 1.80 allows remote attackers to cause a denial of service (memory consumption and crash) via a request with a large number of headers.
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 | yaws | 1.80-1 | — |
| Debian 13 | yaws | 1.80-1 | — |
| Debian 12 | yaws | 1.80-1 | — |
| Debian 5.0 | yaws | 1.77-3+lenny1 | DSA-1740-1 |
| Debian 4.0 | yaws | 1.65-4etch1 | DSA-1740-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Yaws < 1.80 - Multiple Headers Remote Denial of Service Vulnerabilities EDB-8148 · dos · Mar 3, 2009 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- DSA-1740-1 yaws - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
References
- 33979 third-party-advisory
- ADV-2009-0590 vdb-entry
- [oss-security] 20090219 CVE request for yaws mailing-list
- 34239 third-party-advisory
- DSA-1740 vendor-advisory
- 8148 exploit
- http://yaws.hyber.org/
- 33834 vdb-entry