Quick answers
- Is CVE-2026-126193 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-126193 being exploited in the wild.
- How severe is CVE-2026-126193?
- Medium severity, with a CVSS score of 5.3, published 12 November 2026.
- Which products and versions are affected?
- Facelessuser Soup Sieve 0.4 to 2.x.
- Is there a fix for CVE-2026-126193?
- Yes: fixed in 3.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-126193 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-126193?
- Check whether you run Facelessuser Soup Sieve at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 3.0
Technical details
A stack exhaustion vulnerability exists in Soup Sieve versions 0.4 through 2.x due to recursive parsing of deeply nested CSS pseudo-class selectors. An attacker providing a malicious selector string triggers RecursionError when the parser exceeds Python's recursion depth limit. The vulnerability requires the application to accept and parse untrusted selectors; the impact is denial of service per request rather than a persistent outage.
Affected products
- facelessuser Soup Sieve 0.4 to 2.x
Timeline
- 2026-11-12: disclosed
- 2026-09-26: patched: Fix merged via PR #306 (recursion elimination)