{"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-2026-101918 exists.","fix":"Upgrade pyjwt to 2.15.0 or later.","what":"CVE-2026-101918 is a medium-severity denial of service vulnerability in jpadilla pyjwt, published on 28 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-2026-101918 and fix it if it is affected.\n\nWhat it is: CVE-2026-101918 is a medium-severity denial of service vulnerability in jpadilla pyjwt, published on 28 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-2026-101918 exists.\n\nAffected packages and fixed versions:\n- pyjwt (PyPI): affected from 2.0.0a1; fixed in 2.15.0\n- pyjwt (PyPI): affected from 2.0.0a1; fixed in 2.15.0\n- PyJWT (PyPI): affected from 2.0.0a1; fixed in 2.15.0\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-2026-101918/ (Markdown: https://insights.sbomify.com/CVE-2026-101918/index.md)","id":"CVE-2026-101918","markdown":"https://insights.sbomify.com/CVE-2026-101918/index.md","name":"CVE-2026-101918","record":{"aliases":["AZL-105218","CLEANSTART-2026-VH40017","CLEANSTART-2026-YK12318","DEBIAN-CVE-2026-101918","ECHO-0875-60f2-86d9","GHSA-42vr-xj54-vc7v","MINI-6855-hxgf-7xg6","MINI-6mfr-vpwg-cq5g","MINI-74vg-498w-r56c","MINI-86jw-vvhr-xjh9","MINI-9wp4-qrxq-74qm","MINI-9x2x-g45v-cj93","MINI-c7q9-4vm9-vr49","MINI-cgjf-g7vh-ff2c","MINI-g9m4-pgwf-9xgp","MINI-gxch-78pm-hq89","MINI-h89v-3gf3-2h47","MINI-hwhr-g43j-r2qm","MINI-m8p3-5v29-wh88","MINI-mfcx-mwhg-65gw","MINI-q72w-vhf5-c5wr","MINI-q958-ppw6-6cg3","MINI-qr5f-jpqc-jh8g","MINI-r59j-8882-7fm3","MINI-r6g3-rhmj-m2pr","MINI-v3jm-fw2m-4r5f","MINI-v6r8-h8v7-rfvg","MINI-x4cj-8qv5-6845","MINI-x6hw-4h3m-fqrj","MINI-xvc7-77w5-rr5g","PYSEC-2026-4141","UBUNTU-CVE-2026-101918"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python JWT library","requires_auth":"none","summary":"An unauthenticated attacker can cause a denial of service by sending a recursively nested JWT payload that triggers an unhandled RecursionError in PyJWT.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"pyjwt","vendor":"pyjwt_project"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-248","name":"Uncaught Exception"}],"description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacker-controlled recursively nested payload reaches json.loads. As a result, documented PyJWT exception handling does not contain the failure. Consequently, an unauthenticated request can raise an exception that may produce an HTTP 500 response. The advisory-defined affected implementation also includes jwt/api_jwt.py, verify_signature=False. This issue is fixed in version 2.15.0.","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: Unauthenticated RecursionError DoS in pre-verification payload parse (PyJWKClient.get_signing_key_from_jwt / verify_signature=False)","id":"CVE-2026-101918","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"Hypershift: hypershift: unsanitized kubeconfig passthrough from tenant namespace to control plane","id":"CVE-2026-101919"},"packages":[{"ecosystem":"PyPI","fixed":["2.15.0"],"introduced":["2.0.0a1"],"last_affected":[],"package":"PyJWT","purl":null,"source":"GHSA-42vr-xj54-vc7v"},{"ecosystem":"PyPI","fixed":["2.15.0"],"introduced":["2.0.0a1"],"last_affected":[],"package":"pyjwt","purl":"pkg:pypi/pyjwt","source":"GHSA-42vr-xj54-vc7v"},{"ecosystem":"PyPI","fixed":["2.15.0"],"introduced":["2.0.0a1"],"last_affected":[],"package":"pyjwt","purl":"pkg:pypi/pyjwt","source":"PYSEC-2026-4141"}],"prev":{"headline":"PyJWT: PyJWKClient still amplifies unauthenticated JWKS fetches on unknown kid values (incomplete fix of CVE-2026-48524)","id":"CVE-2026-101917"},"products":["pyjwt"],"published":"2026-09-28","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":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-29","vendors":["jpadilla"]},"summary":"An unauthenticated attacker can cause a denial of service by sending a recursively nested JWT payload that triggers an unhandled RecursionError in PyJWT.","url":"https://insights.sbomify.com/CVE-2026-101918/"}