{"id":"CLEANSTART-2024-NX04208","summary":"Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers","details":"CVE-2021-29991 affects multiple packages. Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. See references for individual vulnerability details.","modified":"2026-10-31T16:01:58.376598251Z","published":"2026-10-31T14:33:15.786568Z","upstream":["CVE-2021-29991"],"database_specific":{},"references":[{"type":"ADVISORY","url":"https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2024/CLEANSTART-2024-NX04208.json"},{"type":"WEB","url":"https://osv.dev/vulnerability/CVE-2021-29991"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29991"}],"affected":[{"package":{"name":"thunderbird","ecosystem":"CleanStart","purl":"pkg:apk/cleanstart/thunderbird"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.3.2-r0"}]}],"database_specific":{"source":"https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2024/CLEANSTART-2024-NX04208.json"}},{"package":{"name":"librewolf","ecosystem":"CleanStart","purl":"pkg:apk/cleanstart/librewolf?arch=x86_64"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"92.0.1-r0"}]}],"database_specific":{"source":"https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2024/CLEANSTART-2024-NX04208.json"}},{"package":{"name":"librewolf","ecosystem":"CleanStart","purl":"pkg:apk/cleanstart/librewolf?arch=armv7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"92.0.1-r0"}]}],"database_specific":{"source":"https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2024/CLEANSTART-2024-NX04208.json"}},{"package":{"name":"librewolf","ecosystem":"CleanStart","purl":"pkg:apk/cleanstart/librewolf?arch=aarch64"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"92.0.1-r0"}]}],"database_specific":{"source":"https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2024/CLEANSTART-2024-NX04208.json"}},{"package":{"name":"librewolf","ecosystem":"CleanStart","purl":"pkg:apk/cleanstart/librewolf?arch=x86"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"92.0.1-r0"}]}],"database_specific":{"source":"https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2024/CLEANSTART-2024-NX04208.json"}},{"package":{"name":"librewolf","ecosystem":"CleanStart","purl":"pkg:apk/cleanstart/librewolf?arch=ppc64le"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"92.0.1-r0"}]}],"database_specific":{"source":"https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2024/CLEANSTART-2024-NX04208.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"}]}