{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-9537 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-9537 is a medium-severity vulnerability in JBERGER Mojo::JWT, published on 17 Jul 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-2026-9537 and fix it if it is affected.\n\nWhat it is: CVE-2026-9537 is a medium-severity vulnerability in JBERGER Mojo::JWT, published on 17 Jul 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-2026-9537 in the wild and no public exploit code.\n\nAffected product: JBERGER Mojo::JWT. 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-2026-9537/ (Markdown: https://insights.sbomify.com/CVE-2026-9537/index.md)","id":"CVE-2026-9537","markdown":"https://insights.sbomify.com/CVE-2026-9537/index.md","name":"CVE-2026-9537","record":{"aliases":["DEBIAN-CVE-2026-9537","GHSA-3rp9-gq85-w2mf","UBUNTU-CVE-2026-9537","openSUSE-SU-2026:11450-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Perl JWT library","requires_auth":"none","summary":"Attackers can exploit timing side-channels in HMAC verification to forge JWT tokens, bypassing authentication in applications using this Perl library.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"CPANSec","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-208","name":"Observable Timing Discrepancy"}],"description":"Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison.\n\nThe decode() method compares the supplied signature to the recomputed HMAC with Perl's eq operator, which stops at the first differing byte, so the comparison time varies with the number of matching leading bytes.\n\nA caller that decodes attacker supplied tokens leaks the expected signature through this timing variation, which can be aggregated over many requests to recover the signature and forge a token.","ecosystems":["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":"Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison","id":"CVE-2026-9537","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":1,"n_references":1,"next":{"headline":"Denial of service in Archive::Tar","id":"CVE-2026-9538"},"packages":[{"ecosystem":"openSUSE:Tumbleweed","fixed":["1.20.0-2.1"],"introduced":["0"],"last_affected":[],"package":"perl-Mojo-JWT","purl":"pkg:rpm/opensuse/perl-Mojo-JWT\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:11450-1"}],"prev":{"headline":"A heap-based buffer overflow vulnerability exists in the vtkWindBladeReader FindVariableOffsets functionality of vtk (version(s): 9.6.1).","id":"CVE-2026-9536"},"products":["Mojo::JWT"],"published":"2026-07-17","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-07-20","vendors":["JBERGER"]},"summary":"Attackers can exploit timing side-channels in HMAC verification to forge JWT tokens, bypassing authentication in applications using this Perl library.","url":"https://insights.sbomify.com/CVE-2026-9537/"}