{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-12523 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-12523 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-12523 is a high-severity denial of service vulnerability in Cloudflare quiche, published on 14 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-2026-12523 and fix it if it is affected.\n\nWhat it is: CVE-2026-12523 is a high-severity denial of service vulnerability in Cloudflare quiche, published on 14 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-2026-12523 in the wild and no public exploit code.\n\nAffected product: Cloudflare quiche. 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-2026-12523/ (Markdown: https://insights.sbomify.com/CVE-2026-12523/index.md)","id":"CVE-2026-12523","markdown":"https://insights.sbomify.com/CVE-2026-12523/index.md","name":"CVE-2026-12523","record":{"aliases":["GHSA-4fgf-9xrr-88gf"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"HTTP/3 library","requires_auth":"none","summary":"Attackers can cause memory exhaustion in Cloudflare quiche via crafted HTTP/3 frames, leading to denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"cloudflare","cpe":[{"product":"quiche","vendor":"cloudflare"}],"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-400","name":"Uncontrolled Resource Consumption"}],"description":"Summary\n\nCloudflare quiche's HTTP/3 layer was discovered to be vulnerable to resource exhaustion (i.e., memory) by means of specially crafted HTTP/3 frames.\n\nImpact\n\nHTTP/3 defines multiple frame types to support HTTP message exchanges and connection management. Each frame has a length and a payload whose length depends on the frame type. quiche was found to be vulnerable when parsing some frame types to pre-allocating memory based on the declared length. An attacker would not need to send the number of declared bytes to trigger this issue.\n\nIn addition, quiche was found to not apply QPACK decompression limits correctly. This could allow an attacker to send specially crafted HEADERS frames that would cause more memory commitment than otherwise advertised by MAX_FIELD_SECTION_SIZE (configured by set_max_field_section_size()).\n\nMitigation:\n\n  *  \n\nUsers are requested to upgrade to quiche 0.29.3 which is the earliest version containing the fix for this issue.\n\nCredits: Disclosed responsibly by Sébastien Féry","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-10-22","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-10-22T07:17:14Z","kind":"github_poc","ref":"https://github.com/HORKimhab/CVE-2025-64702-more","stars":0,"title":"CVE-2025-64702, CVE-2026-12523, CVE-2025-13945"}],"tier":"poc_unverified"},"has_fix":false,"headline":"Resource exhaustion in quiche HTTP/3 and QPACK layers","id":"CVE-2026-12523","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Redux Framework \u003c 4.5.13 - Subscriber+ Privilege Escalation to Administrator","id":"CVE-2026-12525"},"packages":[],"prev":{"headline":"Stack buffer overflow in Zephyr hl7800 modem driver parsing network-supplied +CGCONTRDP address fields","id":"CVE-2026-12522"},"products":["quiche"],"published":"2026-07-14","related":[{"cvss_score":8.7,"headline":"Infinite loop triggered by connection ID retirement","id":"CVE-2025-7054","kev_date_added":null,"published":"2025-08-07"},{"cvss_score":7.5,"headline":"Incorrect congestion window growth by invalid ACK ranges","id":"CVE-2025-4821","kev_date_added":null,"published":"2025-06-18"},{"cvss_score":5.9,"headline":"Unlimited resource allocation by QUIC CRYPTO frames flooding in quiche","id":"CVE-2024-1765","kev_date_added":null,"published":"2024-03-12"},{"cvss_score":5.3,"headline":"Incorrect congestion window growth by optimistic ACK","id":"CVE-2025-4820","kev_date_added":null,"published":"2025-06-18"},{"cvss_score":5.3,"headline":"Unbounded queuing of path validation messages in cloudflare-quiche","id":"CVE-2023-6193","kev_date_added":null,"published":"2023-12-12"},{"cvss_score":3.7,"headline":"Unbounded storage of information related to connection ID retirement, in quiche","id":"CVE-2024-1410","kev_date_added":null,"published":"2024-03-12"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-15","vendors":["Cloudflare"]},"summary":"Attackers can cause memory exhaustion in Cloudflare quiche via crafted HTTP/3 frames, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2026-12523/"}