{"answers":{"affected":"3 open source packages ship an affected version, including joserfc. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27932 exists.","fix":"Upgrade joserfc to 1.6.3 or later.","what":"CVE-2026-27932 is a high-severity denial of service vulnerability in authlib joserfc, published on 3 Mar 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-2026-27932 and fix it if it is affected.\n\nWhat it is: CVE-2026-27932 is a high-severity denial of service vulnerability in authlib joserfc, published on 3 Mar 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-2026-27932 exists.\n\nAffected packages and fixed versions:\n- joserfc (PyPI): affected all versions; fixed in 1.6.3\n- joserfc (PyPI): affected all versions; fixed in 1.6.3\n- joserfc (PyPI): affected all versions; fixed in 1.6.3\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-2026-27932/ (Markdown: https://insights.sbomify.com/CVE-2026-27932/index.md)","id":"CVE-2026-27932","markdown":"https://insights.sbomify.com/CVE-2026-27932/index.md","name":"CVE-2026-27932","record":{"aliases":["DEBIAN-CVE-2026-27932","GHSA-w5r5-m38g-f9f9","PYSEC-2026-2529","ROOT-APP-PYPI-CVE-2026-27932","UBUNTU-CVE-2026-27932","openSUSE-SU-2026:10293-1","openSUSE-SU-2026:20322-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python JOSE library","requires_auth":"none","summary":"An unauthenticated attacker can cause CPU exhaustion and Denial of Service in joserfc by sending a JWE token with an unbounded PBES2 iteration count.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"joserfc","vendor":"hsiaoming"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In 1.6.2 and earlier, a resource exhaustion vulnerability in joserfc allows an unauthenticated attacker to cause a Denial of Service (DoS) via CPU exhaustion. When the library decrypts a JSON Web Encryption (JWE) token using Password-Based Encryption (PBES2) algorithms, it reads the p2c (PBES2 Count) parameter directly from the token's protected header. This parameter defines the number of iterations for the PBKDF2 key derivation function. Because joserfc does not validate or bound this value, an attacker can specify an extremely large iteration count (e.g., 2^31 - 1), forcing the server to expend massive CPU resources processing a single token. This vulnerability exists at the JWA layer and impacts all high-level JWE and JWT decryption interfaces if PBES2 algorithms are allowed by the application's policy.","ecosystems":["PyPI","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":"weaponised"},"has_fix":true,"headline":"joserfc PBES2 p2c Unbounded Iteration Count enables Denial of Service (DoS)","id":"CVE-2026-27932","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":5,"n_references":2,"next":{"headline":"Manyfold vulnerable to session hijack via cookie leakage in proxy caches","id":"CVE-2026-27933"},"packages":[{"ecosystem":"PyPI","fixed":["1.6.3"],"introduced":["0"],"last_affected":[],"package":"joserfc","purl":null,"source":"GHSA-w5r5-m38g-f9f9"},{"ecosystem":"PyPI","fixed":["1.6.3"],"introduced":["0"],"last_affected":[],"package":"joserfc","purl":"pkg:pypi/joserfc","source":"GHSA-w5r5-m38g-f9f9"},{"ecosystem":"PyPI","fixed":["1.6.3"],"introduced":["0"],"last_affected":[],"package":"joserfc","purl":"pkg:pypi/joserfc","source":"PYSEC-2026-2529"},{"ecosystem":"openSUSE:Leap 16.0","fixed":["1.1.0-bp160.2.1"],"introduced":["0"],"last_affected":[],"package":"python-joserfc","purl":"pkg:rpm/opensuse/python-joserfc\u0026distro=openSUSE%20Leap%2016.0","source":"openSUSE-SU-2026:20322-1"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["1.6.3-1.1"],"introduced":["0"],"last_affected":[],"package":"python-joserfc","purl":"pkg:rpm/opensuse/python-joserfc\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:10293-1"}],"prev":{"headline":"Windows GDI Information Disclosure Vulnerability","id":"CVE-2026-27931"},"products":["joserfc"],"published":"2026-03-03","related":[{"cvss_score":9.2,"headline":"joserfc has Possible Uncontrolled Resource Consumption Vulnerability Triggered by Logging Arbitrarily Large JWT Token Payloads","id":"CVE-2025-65015","kev_date_added":null,"published":"2025-11-18"}],"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":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"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":"2026-03-04","vendors":["authlib"]},"summary":"An unauthenticated attacker can cause CPU exhaustion and Denial of Service in joserfc by sending a JWE token with an unbounded PBES2 iteration count.","url":"https://insights.sbomify.com/CVE-2026-27932/"}