Description
Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.10, matching a developer-authored selector that places the general sibling combinator inside :has() repeatedly scans each candidate element's following siblings when the right-hand side is absent, producing quadratic work on attacker-controlled HTML. Applications that evaluate a fixed selector such as div:has(a ~ b) over untrusted markup can have a worker occupied for minutes by a small document, while the adjacent sibling form and trusted-only document processing are not affected in the same way. This issue is fixed in version 2.10.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| facelessuser | soupsieve | < 2.10 | — |
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.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | soupsieve | No fix yet | — |
| Ubuntu 26.04 LTS | soupsieve | No fix yet | — |
| Ubuntu 24.04 LTS | soupsieve | No fix yet | — |
| Ubuntu 22.04 LTS | soupsieve | No fix yet | — |
| Ubuntu 20.04 LTS | soupsieve | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | datadog-agent-7.81-core-integrations | 7.81.3-r20 | — |
| Wolfi rolling | open-webui +3 | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | soupsieve | < 2.10.0 | 2.10.0 | GHSA-4j63-6c4x-wfg4 |