{"cve":"CVE-2023-36478","nvd":{"published":"2023-10-10T17:15:11.737","modified":"2026-06-17T06:06:21.220","status":"Modified","description":"Eclipse Jetty provides a web server and servlet container. In versions 11.0.0 through 11.0.15, 10.0.0 through 10.0.15, and 9.0.0 through 9.4.52, an integer overflow in `MetaDataBuilder.checkSize` allows for HTTP/2 HPACK header values to\nexceed their size limit. `MetaDataBuilder.java` determines if a header name or value exceeds the size limit, and throws an exception if the limit is exceeded. However, when length is very large and huffman is true, the multiplication by 4 in line 295\nwill overflow, and length will become negative. `(_size+length)` will now be negative, and the check on line 296 will not be triggered. Furthermore, `MetaDataBuilder.checkSize` allows for user-entered HPACK header value sizes to be negative, potentially leading to a very large buffer allocation later on when the user-entered size is multiplied by 2. This means that if a user provides a negative length value (or, more precisely, a length value which, when multiplied by the 4/3 fudge factor, is negative), and this length value is a very large positive number when multiplied by 2, then the user can cause a very large buffer to be allocated on the server. Users of HTTP/2 can be impacted by a remote denial of service attack. The issue has been fixed in versions 11.0.16, 10.0.16, and 9.4.53. There are no known workarounds.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-190","CWE-400"],"references":["http://www.openwall.com/lists/oss-security/2023/10/18/4","https://github.com/eclipse/jetty.project/pull/9634","https://github.com/eclipse/jetty.project/releases/tag/jetty-10.0.16","https://github.com/eclipse/jetty.project/releases/tag/jetty-11.0.16","https://github.com/eclipse/jetty.project/releases/tag/jetty-9.4.53.v20231009"],"products":["debian:debian_linux","eclipse:jetty","jenkins:jenkins"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-36478","score":0.04832,"percentile":0.91994,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-wgh7-54f2-x98r","url":"https://osv.dev/vulnerability/GHSA-wgh7-54f2-x98r","summary":"HTTP/2 HPACK integer overflow and buffer allocation","modified":"2026-09-10T03:50:08.942440958Z","packages":[{"ecosystem":"Maven","name":"org.eclipse.jetty.http2:http2-hpack","purl":"pkg:maven/org.eclipse.jetty.http2/http2-hpack","ranges":[">=10.0.0 <10.0.16"],"fixed":["10.0.16"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http2:http2-hpack","purl":"pkg:maven/org.eclipse.jetty.http2/http2-hpack","ranges":[">=11.0.0 <11.0.16"],"fixed":["11.0.16"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http3:http3-qpack","purl":"pkg:maven/org.eclipse.jetty.http3/http3-qpack","ranges":[">=10.0.0 <10.0.16"],"fixed":["10.0.16"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http3:http3-qpack","purl":"pkg:maven/org.eclipse.jetty.http3/http3-qpack","ranges":[">=11.0.0 <11.0.16"],"fixed":["11.0.16"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http2:http2-hpack","purl":"pkg:maven/org.eclipse.jetty.http2/http2-hpack","ranges":[">=9.3.0 <9.4.53"],"fixed":["9.4.53"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}