Soup Sieve: Polynomial-time ReDoS (O(n²)) in the `IDENTIFIER` / `VALUE` selector sub-patterns

Summarysoupsieve compiles CSS selector strings with a set of hand-written regular expressions. The shared IDENTIFIER sub-pattern also embedded in VALUE, and therefore in attribute selectors places two adjacent quantified groups over overlapping character classes: ?:classA|ESC+?:classB|ESC, where...

PYSEC-2026-4170 Soup Sieve: Polynomial-time ReDoS (O(n²)) in the `IDENTIFIER` / `VALUE` selector sub-patterns

Summary soupsieve compiles CSS selector strings with a set of hand-written regular expressions. The shared IDENTIFIER sub-pattern also embedded in VALUE, and therefore in attribute selectors places two adjacent quantified groups over overlapping character classes: ?:classA|ESC+?:classB|ESC, where...

PT-2026-105915

Summary Before tokenizing, selector iter trims leading/trailing whitespace and comments by running two regexes over the whole raw selector with .search. The trailing one, RE WS END = re.compiler'WSC$', is anchored only at the end $, not the start. Because .search retries the pattern at every...

PT-2026-105914

Summary soupsieve compiles CSS selector strings with a set of hand-written regular expressions. The shared IDENTIFIER sub-pattern also embedded in VALUE, and therefore in attribute selectors places two adjacent quantified groups over overlapping character classes: ?:classA|ESC+?:classB|ESC, where...

SUSE-SU-2026:4365-1 Security update for python-soupsieve

This update for python-soupsieve fixes the following issues: - CVE-2026-85999: quadratic complexity when running the whitespace/comment trimming regex REWSEND can lead to DoS bsc1281119. - CVE-2026-86000: quadratic complexity when running the IDENTIFIER / VALUE selector sub-patterns can lead to a...

Security update for python-soupsieve

This update for python-soupsieve fixes the following issues: CVE-2026-85999: quadratic complexity when running the whitespace/comment trimming regex REWSEND can lead to DoS bsc1281119. CVE-2026-86000: quadratic complexity when running the IDENTIFIER / VALUE selector sub-patterns can lead to a DoS...

Security Bulletin: IBM InfoSphere Optim Archive Viewer is affected by multiple vulnerabilities in soupsieve (CVE-2026-49476, CVE-2026-49477)

Summary Multiple vulnerabilities in the soupsieve CSS selector parsing library CVE-2026-49476, CVE-2026-49477 used by IBM InfoSphere Optim Archive Viewer have been addressed by upgrading the component to version 2.9.1 on Windows and version 2.9.2 on Linux. Vulnerability Details CVEID:CVE-2026-494...

OPENSUSE-SU-2026:11866-1 python313-soupsieve-2.9.2-1.1 on GA media

These are all security issues fixed in the python313-soupsieve-2.9.2-1.1 package on the GA media of openSUSE Tumbleweed...

CVE-2026-85999

creationtimestamp| type| source ---|---|--- 2026-09-17 22:35:13+00:00| published-proof-of-concept| https://github.com/facelessuser/soupsieve/security/advisories/GHSA-j934-xhv5-fg8f 2026-09-18 06:30:57+00:00| seen| https://gist.github.com/alon710/320920418b1280f455d87d486f8b865e...

CVE-2026-86000

creationtimestamp| type| source ---|---|--- 2026-09-17 22:35:11+00:00| published-proof-of-concept| https://github.com/facelessuser/soupsieve/security/advisories/GHSA-gjv8-xp57-g29c 2026-09-18 05:31:29+00:00| seen| https://gist.github.com/alon710/28e39e82ccb12ea34e715caa280614a0...

Regular Expression Denial of Service (ReDoS)

Overview Affected versions of this package are vulnerable to Regular Expression Denial of Service ReDoS via the IDENTIFIER regex pattern in soupsieve/cssparser.py, which uses a vulnerable regular expression that allows an attacker to supply a CSS selector string that causes catastrophic...

Soup Sieve: Polynomial-time ReDoS (O(n²)) in the `IDENTIFIER` / `VALUE` selector sub-patterns

Summary soupsieve compiles CSS selector strings with a set of hand-written regular expressions. The shared IDENTIFIER sub-pattern also embedded in VALUE, and therefore in attribute selectors places two adjacent quantified groups over overlapping character classes: ?:classA|ESC+?:classB|ESC, where...

GHSA-GJV8-XP57-G29C Soup Sieve: Polynomial-time ReDoS (O(n²)) in the `IDENTIFIER` / `VALUE` selector sub-patterns

Summary soupsieve compiles CSS selector strings with a set of hand-written regular expressions. The shared IDENTIFIER sub-pattern also embedded in VALUE, and therefore in attribute selectors places two adjacent quantified groups over overlapping character classes: ?:classA|ESC+?:classB|ESC, where...

Regular Expression Denial of Service (ReDoS)

Overview Affected versions of this package are vulnerable to Regular Expression Denial of Service ReDoS due to inefficient whitespace/comment trimming in CSSParser.selectoriter in soupsieve/cssparser.py. An attacker can stall selector parsing by supplying a long, otherwise valid CSS selector with...

Soup Sieve: Polynomial-time ReDoS (O(n²)) in the whitespace/comment trimming regex `RE_WS_END` (triggers on VALID selectors)

Summary Before tokenizing, selectoriter trims leading/trailing whitespace and comments by running two regexes over the whole raw selector with .search. The trailing one, REWSEND = re.compiler'WSC$', is anchored only at the end $, not the start. Because .search retries the pattern at every offset,...

Security Bulletin: IBM SOAR QRadar Plugin App is vulnerable to using components with known vulnerabilities (CVE-2026-49476, CVE-2026-49477)

Summary The product includes vulnerable components e.g., framework libraries that may be identified and exploited with automated tools. IBM SOAR QRadar Plugin App has addressed the applicable CVEs with an update. Vulnerability Details CVEID:CVE-2026-49476 DESCRIPTION: Soup Sieve is a CSS selector...

PT-2026-94387

Name of the Vulnerable Software and Affected Versions Soup Sieve versions prior to 2.9 Description A Regular Expression Denial of Service ReDoS exists in the selector parser located in src/soupsieve/css parser.py. The IDENTIFIER pattern uses adjacent quantified groups over overlapping character...

OESA-2026-3619 python-soupsieve security update

Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. It aims to provide selecting, matching, and filtering using modern CSS selectors. Soup Sieve currently provides selectors from the CSS level 1 specifications up through the latest CSS level 4 drafts and beyond though...

SUSE SLED15 / SLES15 Security Update : python-soupsieve (SUSE-SU-2026:3239-1)

The remote SUSE Linux SLED15 / SLEDSAP15 / SLES15 / SLESSAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3239-1 advisory. This update for python-soupsieve fixes the following issues - CVE-2026-49476: Memory Exhaustion via Large...

SUSE SLED15 / SLES15 Security Update : python-soupsieve (SUSE-SU-2026:3240-1)

The remote SUSE Linux SLED15 / SLEDSAP15 / SLES15 / SLESSAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3240-1 advisory. This update for python-soupsieve fixes the following issues - CVE-2026-49476: Memory Exhaustion via Large...