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| purl | pkg:gem/nokogiri@1.18.9 |
| Vulnerability | Summary | Fixed by |
|---|---|---|
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VCID-jfh3-1sgm-7ug2
Aliases: GHSA-wx95-c6cv-8532 |
Nokogiri does not check the return value from xmlC14NExecute ## Summary Nokogiri's CRuby extension fails to check the return value from `xmlC14NExecute` in the method `Nokogiri::XML::Document#canonicalize` and `Nokogiri::XML::Node#canonicalize`. When canonicalization fails, an empty string is returned instead of raising an exception. This incorrect return value may allow downstream libraries to accept invalid or incomplete canonicalized XML, which has been demonstrated to enable signature validation bypass in SAML libraries. JRuby is not affected, as the Java implementation correctly raises `RuntimeError` on canonicalization failure. ## Mitigation Upgrade to Nokogiri `>= 1.19.1`. ## Severity The maintainers have assessed this as **Medium** severity. Nokogiri itself is a parsing library without a clear security boundary related to canonicalization, so the direct impact is that a method returns incorrect data on invalid input. However, this behavior was exploited in practice to bypass SAML signature validation in downstream libraries (see References). ## Credit This vulnerability was responsibly reported by HackerOne researcher `d4d`. |
Affected by 0 other vulnerabilities. |
| Vulnerability | Summary | Aliases |
|---|---|---|
| VCID-6r5w-pgkx-v3cb | Nokogiri patches vendored libxml2 to resolve multiple CVEs ## Summary Nokogiri v1.18.9 patches the vendored libxml2 to address CVE-2025-6021, CVE-2025-6170, CVE-2025-49794, CVE-2025-49795, and CVE-2025-49796. ## Impact and severity ### CVE-2025-6021 A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input. NVD claims a severity of 7.5 High (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/17d950ae ### CVE-2025-6170 A flaw was found in the interactive shell of the xmllint command-line tool, used for parsing XML files. When a user inputs an overly long command, the program does not check the input size properly, which can cause it to crash. This issue might allow attackers to run harmful code in rare configurations without modern protections. NVD claims a severity of 2.5 Low (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L) Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/5e9ec5c1 ### CVE-2025-49794 A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path="..."/> schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program's crash using libxml or other possible undefined behaviors. NVD claims a severity of 9.1 Critical (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H) Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/81cef8c5 ### CVE-2025-49795 A NULL pointer dereference vulnerability was found in libxml2 when processing XPath XML expressions. This flaw allows an attacker to craft a malicious XML input to libxml2, leading to a denial of service. NVD claims a severity of 7.5 High (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/62048278 ### CVE-2025-49796 A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to sensitive data being corrupted in memory. NVD claims a severity of 9.1 Critical (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H) Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/81cef8c5 ## Affected Versions - Nokogiri < 1.18.9 when using CRuby (MRI) with vendored libxml2 ## Patched Versions - Nokogiri >= 1.18.9 ## Mitigation Upgrade to Nokogiri v1.18.9 or later. Users who are unable to upgrade Nokogiri may also choose a more complicated mitigation: compile and link Nokogiri against patched external libxml2 libraries which will also address these same issues. ## References - https://github.com/sparklemotion/nokogiri/pull/3526 - https://nvd.nist.gov/vuln/detail/CVE-2025-6021 - https://nvd.nist.gov/vuln/detail/CVE-2025-6170 - https://nvd.nist.gov/vuln/detail/CVE-2025-49794 - https://nvd.nist.gov/vuln/detail/CVE-2025-49795 - https://nvd.nist.gov/vuln/detail/CVE-2025-49796 |
GHSA-353f-x4gh-cqq8
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