DEBIAN-CVE-2026-85999
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-85999
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-85999.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-85999
- Upstream
- Published
- 2026-09-17T16:18:16Z
- Modified
- 2026-09-19T07:01:09Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- Summary
- [none]
- Details
-
Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.9, selector_iter in src/soupsieve/css_parser.py trims the raw selector with RE_WS_END, an end-anchored WSC whitespace-and-comment expression used with search(), so the regular expression engine retries a greedy scan at every starting offset. An attacker-controlled valid selector containing a long internal whitespace run, or a selector containing a long CSS comment run followed by another token, causes quadratic CPU work before tokenization. User-controlled selectors can reach the path through soupsieve.compile() and BeautifulSoup.select(), while applications using only hard-coded selectors are unaffected. This root cause is separate from the IDENTIFIER and VALUE backtracking vulnerability because the cost occurs in RE_WS_END.search during trimming rather than token matching. The resulting CPU consumption can hold the Python GIL, exhaust workers, and stall a service without causing memory corruption or code execution. The issue is fixed in version 2.9.
- References
Affected packages
Debian:12 / soupsieve
Package
- Name
- soupsieve
- Purl
- pkg:deb/debian/soupsieve?arch=source&distro=bookworm
Debian:13 / soupsieve
Package
- Name
- soupsieve
- Purl
- pkg:deb/debian/soupsieve?arch=source&distro=trixie
Debian:14 / soupsieve
Package
- Name
- soupsieve
- Purl
- pkg:deb/debian/soupsieve?arch=source&distro=forky