{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-19953 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-19953 is a medium-severity vulnerability in perl-URI, published on 31 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-19953 and fix it if it is affected.\n\nWhat it is: CVE-2026-19953 is a medium-severity vulnerability in perl-URI, published on 31 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-19953 in the wild and no public exploit code.\n\nAffected product: perl-URI. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-19953/ (Markdown: https://insights.sbomify.com/CVE-2026-19953/index.md)","id":"CVE-2026-19953","markdown":"https://insights.sbomify.com/CVE-2026-19953/index.md","name":"CVE-2026-19953","record":{"aliases":["ALSA-2026:84587","ALSA-2026:84588","ALSA-2026:84590","AZL-98562","BELL-CVE-2026-19953","DEBIAN-CVE-2026-19953","ECHO-21d4-7d4e-9762","GHSA-wf9v-63v3-ff2x","MGASA-2026-0445","OESA-2026-3588","OESA-2026-3589","OESA-2026-3590","OESA-2026-3591","OESA-2026-3714","RHSA-2026:84587","RHSA-2026:84588","RHSA-2026:84590","RLSA-2026:84587","RLSA-2026:84588","RLSA-2026:84590","SUSE-SU-2026:23633-1","SUSE-SU-2026:4046-1","SUSE-SU-2026:4070-1","UBUNTU-CVE-2026-19953","openSUSE-SU-2026:11663-1","openSUSE-SU-2026:21773-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Perl URI library","requires_auth":"none","summary":"Attackers can bypass host-based security checks like SSRF filters or allowlists by exploiting Unicode normalization flaws in URI parsing.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"CPANSec","cpe":[],"cvss":{"score":6.5,"severity":"medium","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-1289","name":"Improper Validation of Unsafe Equivalence in Input"}],"description":"URI versions before 5.36 for Perl encode non-NFC host names to non-standard punycode labels via missing normalization in nameprep.\n\nnameprep lowercases each host label but performs no Unicode normalization. IDNA requires a label to be normalized to Form C before it is encoded (RFC 5891), so a label that is not already in NFC is encoded to a different A-label than its normalized form. A label built from the precomposed Devanagari sequence U+0958 U+093E encodes to xn--72b5c without normalization but to xn--11b2fg after NFC normalization, and xn--72b5c does not round-trip back to the original label.\n\nAny caller that reads host() from a URI built from untrusted input and uses it for a security decision (an allow or deny list, an SSRF filter, deduplication, a cache key) sees the non-standard label, while a client that fetches the same URL resolves the NFC form, so the check and the fetch can disagree about the host.","ecosystems":["AlmaLinux:10","AlmaLinux:8","AlmaLinux:9","Red Hat:enterprise_linux:10.2","Red Hat:enterprise_linux:8::baseos","Red Hat:enterprise_linux:9::appstream","Rocky Linux:10","Rocky Linux:8","Rocky Linux:9","SUSE:Linux Enterprise Module for Basesystem 15 SP7","SUSE:Linux Enterprise Server 16.0","SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5","SUSE:Linux Enterprise Server for SAP applications 16.0","openSUSE:Leap 16.0","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"URI versions before 5.36 for Perl encode non-NFC host names to non-standard punycode labels via missing normalization in nameprep.","id":"CVE-2026-19953","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":15,"n_references":4,"next":{"headline":"Net::Whois::Raw versions before 2.99044 for Perl ship a pwhois command-line tool that queries WHOIS for the wrong domain for unicode domain names.","id":"CVE-2026-19954"},"packages":[{"ecosystem":"AlmaLinux:10","fixed":["5.27-3.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/almalinux/perl-URI","source":"ALSA-2026:84587"},{"ecosystem":"AlmaLinux:8","fixed":["1.73-4.el8_10"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/almalinux/perl-URI","source":"ALSA-2026:84590"},{"ecosystem":"AlmaLinux:9","fixed":["5.09-3.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/almalinux/perl-URI","source":"ALSA-2026:84588"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:5.27-3.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/redhat/perl-URI","source":"RHSA-2026:84587"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1.73-4.el8_10"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/redhat/perl-URI","source":"RHSA-2026:84590"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["0:5.09-3.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/redhat/perl-URI","source":"RHSA-2026:84588"},{"ecosystem":"Rocky Linux:10","fixed":["0:5.27-3.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/rocky-linux/perl-URI?distro=rocky-linux-10-aarch64\u0026epoch=0","source":"RLSA-2026:84587"},{"ecosystem":"Rocky Linux:8","fixed":["0:1.73-4.el8_10"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/rocky-linux/perl-URI?distro=rocky-linux-8-x86-64\u0026epoch=0","source":"RLSA-2026:84590"},{"ecosystem":"Rocky Linux:9","fixed":["0:5.09-3.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/rocky-linux/perl-URI?distro=rocky-linux-9-x86-64\u0026epoch=0","source":"RLSA-2026:84588"},{"ecosystem":"SUSE:Linux Enterprise Module for Basesystem 15 SP7","fixed":["1.73-150000.3.3.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/suse/perl-URI\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7","source":"SUSE-SU-2026:4046-1"},{"ecosystem":"SUSE:Linux Enterprise Server 16.0","fixed":["5.310.0-160000.3.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/suse/perl-URI\u0026distro=SUSE%20Linux%20Enterprise%20Server%2016.0","source":"SUSE-SU-2026:23633-1"},{"ecosystem":"SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5","fixed":["1.60-9.3.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/suse/perl-URI\u0026distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5","source":"SUSE-SU-2026:4070-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP applications 16.0","fixed":["5.310.0-160000.3.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/suse/perl-URI\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0","source":"SUSE-SU-2026:23633-1"},{"ecosystem":"openSUSE:Leap 16.0","fixed":["5.310.0-160000.3.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/opensuse/perl-URI\u0026distro=openSUSE%20Leap%2016.0","source":"openSUSE-SU-2026:21773-1"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["5.360.0-1.1"],"introduced":["0"],"last_affected":[],"package":"perl-URI","purl":"pkg:rpm/opensuse/perl-URI\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:11663-1"}],"prev":{"headline":"Path traversal in Frontend Admin by DynamiApps","id":"CVE-2026-19952"},"products":[],"published":"2026-08-31","related":[],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"BSD","name":"Rocky Linux","prefix":"RLSA"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-01","vendors":[]},"summary":"Attackers can bypass host-based security checks like SSRF filters or allowlists by exploiting Unicode normalization flaws in URI parsing.","url":"https://insights.sbomify.com/CVE-2026-19953/"}