{"answers":{"affected":"3 open source packages ship an affected version, including joserfc.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48990 exists.","fix":"Upgrade joserfc to 1.6.7 or later.","what":"CVE-2026-48990 is a medium-severity denial of service vulnerability in authlib joserfc, published on 17 Jun 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-2026-48990 and fix it if it is affected.\n\nWhat it is: CVE-2026-48990 is a medium-severity denial of service vulnerability in authlib joserfc, published on 17 Jun 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-2026-48990 exists.\n\nAffected packages and fixed versions:\n- joserfc (PyPI): affected from 1.3.4; fixed in 1.6.7\n- joserfc (PyPI): affected from 1.3.4; fixed in 1.6.7\n- joserfc (PyPI): affected from 1.3.4; fixed in 1.6.7\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-2026-48990/ (Markdown: https://insights.sbomify.com/CVE-2026-48990/index.md)","id":"CVE-2026-48990","markdown":"https://insights.sbomify.com/CVE-2026-48990/index.md","name":"CVE-2026-48990","record":{"aliases":["CLEANSTART-2026-QT40101","DEBIAN-CVE-2026-48990","GHSA-wphv-vfrh-23q5","MINI-22v5-7782-8j2c","PYSEC-2026-2530","ROOT-APP-PYPI-CVE-2026-48990","UBUNTU-CVE-2026-48990","openSUSE-SU-2026:11067-1"],"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":"Attackers can cause resource exhaustion by sending oversized unencoded JWS payloads that bypass size limits in the joserfc library.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"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-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In versions 1.3.4 through 1.6.5, joserfc accepts oversized RFC7797 b64=false JWS payloads without applying JWSRegistry.max_payload_length, which can lead to resource exhaustion. The normal JWS compact and flattened JSON paths reject payloads above the configured payload-size limit with ExceededSizeError. The RFC7797 unencoded payload paths do not make the same check. A valid b64=false compact or flattened JSON JWS can therefore deserialize successfully with a payload larger than JWSRegistry.max_payload_length. Applications that accept lower-trust JWS values and rely on joserfc to reject oversized token content during verification have a moderate availability risk. This issue has been fixed in version 1.6.7.","ecosystems":["PyPI","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: b64=false RFC7797 JWS payloads bypass JWSRegistry payload-size limits during deserialization","id":"CVE-2026-48990","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":4,"n_references":2,"next":{"headline":"XianYuLauncher: Legacy Microsoft account OAuth sign-in flow lacks PKCE and state validation","id":"CVE-2026-48991"},"packages":[{"ecosystem":"PyPI","fixed":["1.6.7"],"introduced":["1.3.4"],"last_affected":[],"package":"joserfc","purl":null,"source":"GHSA-wphv-vfrh-23q5"},{"ecosystem":"PyPI","fixed":["1.6.7"],"introduced":["1.3.4"],"last_affected":[],"package":"joserfc","purl":"pkg:pypi/joserfc","source":"GHSA-wphv-vfrh-23q5"},{"ecosystem":"PyPI","fixed":["1.6.7"],"introduced":["1.3.4"],"last_affected":[],"package":"joserfc","purl":"pkg:pypi/joserfc","source":"PYSEC-2026-2530"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["1.7.1-1.1"],"introduced":["0"],"last_affected":[],"package":"python-joserfc","purl":"pkg:rpm/opensuse/python-joserfc\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:11067-1"}],"prev":{"headline":"Windows-MCP: HTTP transports expose unauthenticated PowerShell control with wildcard CORS","id":"CVE-2026-48989"},"products":["joserfc"],"published":"2026-06-17","related":[],"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":"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":"2026-06-18","vendors":["authlib"]},"summary":"Attackers can cause resource exhaustion by sending oversized unencoded JWS payloads that bypass size limits in the joserfc library.","url":"https://insights.sbomify.com/CVE-2026-48990/"}