{"id":"CVE-2026-34183","state":"PUBLISHED","title":"Unbounded Memory Growth in the QUIC PATH_CHALLENGE Handler","description":"Issue summary: Remote peer may exhaust heap memory of the QUIC\nserver or client by flooding it with packets containing PATH_CHALLENGE\nframes.\n\nImpact summary: A malicious remote peer can cause an unbounded\nmemory allocation which can lead to an abnormal termination of the\napplication acting as a QUIC client or server and a Denial of Service.\n\nA remote peer may exhaust heap memory by flooding the local\nQUIC stack with PATH_CHALLENGE frames. The local QUIC stack\nallocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives.\nThe allocated PATH_RESPONSE frame gets freed only when the remote\npeer acknowledges reception of the PATH_RESPONSE frame which will\nnot be done by a malicious peer.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by\nthis issue. The QUIC stack is outside of OpenSSL FIPS module\nboundary.","publishedAt":"2026-06-09T16:03:23.623Z","updatedAt":"2026-06-10T15:51:12.557Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"openssl","products":["OpenSSL OpenSSL"],"affected":[{"vendor":"OpenSSL","product":"OpenSSL","defaultStatus":"unaffected","versions":[{"version":"4.0.0","status":"affected","lessThan":"4.0.1","versionType":"semver"},{"version":"3.6.0","status":"affected","lessThan":"3.6.3","versionType":"semver"},{"version":"3.5.0","status":"affected","lessThan":"3.5.7","versionType":"semver"},{"version":"3.4.0","status":"affected","lessThan":"3.4.6","versionType":"semver"}]}],"references":["https://openssl-library.org/news/secadv/20260609.txt","https://github.com/openssl/openssl/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9eb","https://github.com/openssl/openssl/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517","https://github.com/openssl/openssl/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9ac","https://github.com/openssl/openssl/commit/d2e9efbe4900a373227deb136e8665401404ffac"],"weaknesses":["CWE-1325"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/34xxx/CVE-2026-34183.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-34183","state":"PUBLISHED","datePublished":"2026-06-09T16:03:23.623Z","dateUpdated":"2026-06-10T15:51:12.557Z","assignerShortName":"openssl","assignerOrgId":"3a12439a-ef3a-4c79-92e6-6081a721f1e5","dateReserved":"2026-03-26T09:29:36.013Z"},"containers":{"cna":{"title":"Unbounded Memory Growth in the QUIC PATH_CHALLENGE Handler","descriptions":[{"lang":"en","value":"Issue summary: Remote peer may exhaust heap memory of the QUIC\nserver or client by flooding it with packets containing PATH_CHALLENGE\nframes.\n\nImpact summary: A malicious remote peer can cause an unbounded\nmemory allocation which can lead to an abnormal termination of the\napplication acting as a QUIC client or server and a Denial of Service.\n\nA remote peer may exhaust heap memory by flooding the local\nQUIC stack with PATH_CHALLENGE frames. The local QUIC stack\nallocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives.\nThe allocated PATH_RESPONSE frame gets freed only when the remote\npeer acknowledges reception of the PATH_RESPONSE frame which will\nnot be done by a malicious peer.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by\nthis issue. The QUIC stack is outside of OpenSSL FIPS module\nboundary."}],"affected":[{"vendor":"OpenSSL","product":"OpenSSL","defaultStatus":"unaffected","versions":[{"version":"4.0.0","status":"affected","lessThan":"4.0.1","versionType":"semver"},{"version":"3.6.0","status":"affected","lessThan":"3.6.3","versionType":"semver"},{"version":"3.5.0","status":"affected","lessThan":"3.5.7","versionType":"semver"},{"version":"3.4.0","status":"affected","lessThan":"3.4.6","versionType":"semver"}]}],"references":[{"url":"https://openssl-library.org/news/secadv/20260609.txt","name":"OpenSSL Advisory","tags":["vendor-advisory"]},{"url":"https://github.com/openssl/openssl/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9eb","name":"4.0.1 git commit","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517","name":"3.6.3 git commit","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9ac","name":"3.5.7 git commit","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/d2e9efbe4900a373227deb136e8665401404ffac","name":"3.4.6 git commit","tags":["patch"]}],"metrics":[{"format":"other","other":{"content":{"text":"Moderate"},"type":"https://openssl-library.org/policies/general/security-policy/"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1325","description":"CWE-1325 Improperly Controlled Sequential Memory Allocation","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"openssl","orgId":"3a12439a-ef3a-4c79-92e6-6081a721f1e5","dateUpdated":"2026-06-10T07:47:56.298Z"},"credits":[{"lang":"en","type":"reporter","value":"Abhinav Agarwal"},{"lang":"en","type":"remediation developer","value":"Alexandr Nedvedicky"}],"datePublic":"2026-06-09T14:00:00.000Z","source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-06-10T15:50:50.340971Z","id":"CVE-2026-34183","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-10T15:51:12.557Z"}}]}}}