Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve contains a regular expression vulnerable to catastrophic backtracking when processing an attribute selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select() / .select_one() to cause CPU exhaustion and denial of service. This issue is fixed in version 2.8.4.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 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 Comma-Separated Selector Lists (bsc#1271187).
    - CVE-2026-49477: Regular Expression Denial of Service (ReDoS) via Selector Parser (bsc#1271188).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 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 Comma-Separated Selector Lists (bsc#1271187).
    - CVE-2026-49477: Regular Expression Denial of Service (ReDoS) via Selector Parser (bsc#1271188).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES16 / SLES_SAP16 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:22660-1 advisory.

    This update for python-soupsieve fixes the following issues

    - CVE-2026-49476: Memory Exhaustion via Large Comma-Separated Selector Lists (bsc#1271187).
    - CVE-2026-49477: Regular Expression Denial of Service (ReDoS) via Selector Parser (bsc#1271188).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21342-1 advisory.

    This update for python-soupsieve fixes the following issues

    - CVE-2026-49476: Memory Exhaustion via Large Comma-Separated Selector Lists (bsc#1271187).
    - CVE-2026-49477: Regular Expression Denial of Service (ReDoS) via Selector Parser (bsc#1271188).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS     selector parser in soupsieve contains a regular expression vulnerable to catastrophic backtracking when     processing an attribute selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an     attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select()     / .select_one() to cause CPU exhaustion and denial of service. This issue is fixed in version 2.8.4.
    (CVE-2026-49477)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS
    selector parser in soupsieve contains a regular expression vulnerable to catastrophic backtracking when
    processing an attribute selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an
    attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select()
    / .select_one() to cause CPU exhaustion and denial of service. This issue is fixed in version 2.8.4.
    (CVE-2026-49477)

ID	Name	Product	Family	Severity
330321	SUSE SLED15 / SLES15 Security Update : python-soupsieve (SUSE-SU-2026:3240-1)	Nessus	SuSE Local Security Checks	high
330297	SUSE SLED15 / SLES15 Security Update : python-soupsieve (SUSE-SU-2026:3239-1)	Nessus	SuSE Local Security Checks	high
327589	SUSE SLES16 Security Update : python-soupsieve (SUSE-SU-2026:22660-1)	Nessus	SuSE Local Security Checks	high
327231	openSUSE 16 Security Update : python-soupsieve (openSUSE-SU-2026:21342-1)	Nessus	SuSE Local Security Checks	high
327147	Linux Distros Unpatched Vulnerability : CVE-2026-49477	Nessus	Misc.	high
444558	SCA: security update for soupsieve (GHSA-836r-79rf-4m37)	Tenable Cloud Security	SCA Checks	high
444558	SCA: security update for soupsieve (GHSA-836r-79rf-4m37)	Tenable Self-Hosted Container Security	SCA Checks	high

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CVE-2026-49477

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