{"answers":{"affected":"3 open source packages ship an affected version, including pyjwt and PyJWT. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103001 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-103001 is a medium-severity vulnerability in jpadilla pyjwt, published on 30 Sep 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-2026-103001 and fix it if it is affected.\n\nWhat it is: CVE-2026-103001 is a medium-severity vulnerability in jpadilla pyjwt, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103001 exists.\n\nAffected packages and fixed versions:\n- pyjwt (PyPI): affected from 2.11.0 up to 2.13.0; no fix listed\n- pyjwt (PyPI): affected from 2.11.0 up to 2.13.0; no fix listed\n- PyJWT (PyPI): affected from 2.11.0 up to 2.13.0; no fix listed\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-2026-103001/ (Markdown: https://insights.sbomify.com/CVE-2026-103001/index.md)","id":"CVE-2026-103001","markdown":"https://insights.sbomify.com/CVE-2026-103001/index.md","name":"CVE-2026-103001","record":{"aliases":["AZL-105642","BELL-CVE-2026-103001","CLEANSTART-2026-AF59744","CLEANSTART-2026-CW76652","DEBIAN-CVE-2026-103001","ECHO-8665-d21f-1204","GHSA-gvp8-978c-rx2q","MINI-2c7m-qv8f-mcfv","MINI-2wwg-x4c5-26xv","MINI-3ggg-p56x-wcjx","MINI-4c43-pgjv-h2h3","MINI-57xc-mqqm-4phg","MINI-6ccv-g2rm-mj94","MINI-7f5x-22j4-m93c","MINI-c5vf-3c2m-vpwc","MINI-f463-842q-gj7v","MINI-f5r6-7prx-45j8","MINI-fmrw-r96r-2q9h","MINI-gqhg-q8v3-h2fc","MINI-h5g5-pgx3-8j9h","MINI-hcmq-p6q3-v8cj","MINI-hvwp-5xp7-m53v","MINI-mr3w-24jp-9gqg","MINI-p8xc-cx6h-fr42","MINI-r5wq-8hjw-jxj2","MINI-rwmm-f6pr-5p65","MINI-w678-3jhm-cc5f","MINI-w9fp-v4vh-7v9v","MINI-wqxq-q76c-f8vq","PYSEC-2026-4146","UBUNTU-CVE-2026-103001"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Python JWT library","requires_auth":"none","summary":"Attackers can bypass JWT claim verification by exploiting mutable options dictionary reuse in PyJWT, allowing acceptance of invalid tokens.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"pyjwt","vendor":"pyjwt_project"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-471","name":"Modification of Assumed-Immutable Data (MAID)"}],"description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.11.0 through 2.13.0, PyJWT's PyJWT._merge_options() method can modify a caller-supplied mutable options mapping when verify_signature is false. If an application reuses that same mapping for a later decode() or decode_complete() call and changes verify_signature to true, the mapping can retain false values for expiration, not-before, issued-at, audience, issuer, subject, and JWT ID checks. A signed token with invalid registered claims can then be accepted without disabling signature verification, but applications that create a fresh options mapping for each call are not affected.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse","id":"CVE-2026-103001","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"next.js cache leak on warm `use cache` handlers accessing root param","id":"CVE-2026-103004"},"packages":[{"ecosystem":"PyPI","fixed":[],"introduced":["2.11.0"],"last_affected":["2.13.0"],"package":"PyJWT","purl":null,"source":"GHSA-gvp8-978c-rx2q"},{"ecosystem":"PyPI","fixed":[],"introduced":["2.11.0"],"last_affected":["2.13.0"],"package":"pyjwt","purl":"pkg:pypi/pyjwt","source":"GHSA-gvp8-978c-rx2q"},{"ecosystem":"PyPI","fixed":[],"introduced":["2.11.0"],"last_affected":["2.13.0"],"package":"pyjwt","purl":"pkg:pypi/pyjwt","source":"PYSEC-2026-4146"}],"prev":{"headline":"pypdf: Possible large memory usage when retrieving alphabetical page labels","id":"CVE-2026-103000"},"products":["pyjwt"],"published":"2026-09-30","related":[{"cvss_score":9.1,"headline":"PyJWT: Asymmetric-PEM detection bypass: whitespace/line-ending-mutated public keys skip the HS/asymmetric confusion guard","id":"CVE-2026-102268","kev_date_added":null,"published":"2026-09-28"},{"cvss_score":7.5,"headline":"PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)","id":"CVE-2026-32597","kev_date_added":null,"published":"2026-03-12"},{"cvss_score":7.4,"headline":"PyJWK accepts empty HMAC keys, bypassing PyJWT's empty-key validation","id":"CVE-2026-102266","kev_date_added":null,"published":"2026-09-28"},{"cvss_score":7.4,"headline":"PyJWT: PyJWKClient follows redirects when fetching JWKS","id":"CVE-2026-102267","kev_date_added":null,"published":"2026-09-28"},{"cvss_score":7.4,"headline":"PyJWT: Public keys in DER form are accepted as HMAC secrets, bypassing the CVE-2022-29217 guard","id":"CVE-2026-102271","kev_date_added":null,"published":"2026-09-28"},{"cvss_score":7.4,"headline":"PyJWT BOM Bypass","id":"CVE-2026-102272","kev_date_added":null,"published":"2026-09-28"},{"cvss_score":7.4,"headline":"PyJWT accepts public JWK containers as HMAC secrets","id":"CVE-2026-102273","kev_date_added":null,"published":"2026-09-28"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-05","vendors":["jpadilla"]},"summary":"Attackers can bypass JWT claim verification by exploiting mutable options dictionary reuse in PyJWT, allowing acceptance of invalid tokens.","url":"https://insights.sbomify.com/CVE-2026-103001/"}