{"id":"CVE-2026-6681","aliases":["ALPINE-CVE-2026-6681","DEBIAN-CVE-2026-6681","EUVD-2026-39556","GHSA-6q89-vxvr-wgv2","JLSEC-2026-754","UBUNTU-CVE-2026-6681"],"status":"published","title":"PKCS#7 decode ignores caller output buffer size, writing past buffer bounds","description":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.","severity":{"version":"4.0","score":1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/U:Clear","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00376,"percentile":0.31909,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-120","CWE-787"],"published":"2026-06-25T20:11:39Z","modified":"2026-11-03T06:33:03Z","fixes":[{"ecosystem":"Alpine:v3.24","package":"wolfssl","fixed_in":["5.9.2-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"wolfssl","fixed_in":["5.5.4-2+deb12u3"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"wolfssl","fixed_in":["5.7.2-0.1+deb13u2"],"sources":["osv"]},{"ecosystem":"Julia","package":"wolfSSL_jll","fixed_in":["5.9.2+0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.24","package":"wolfssl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.10.0"},{"fixed":"5.9.2-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"wolfssl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.5.4-2+deb12u3"}]}],"versions":["5.5.4-2","5.5.4-2+deb12u1","5.5.4-2+deb12u2"]},{"source":"osv","ecosystem":"Debian:13","package":"wolfssl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.2-0.1+deb13u2"}]}],"versions":["5.7.2-0.1","5.7.2-0.1+deb13u1"]},{"source":"osv","ecosystem":"Julia","package":"wolfSSL_jll","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.9.2+0"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"wolfssl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.8+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"wolfssl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.10.2+dfsg-2","3.12.0+dfsg-1","3.12.2+dfsg-1","3.13.0+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"wolfssl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.0+dfsg-2","4.2.0+dfsg-1","4.2.0+dfsg-2","4.2.0+dfsg-3","4.3.0+dfsg-2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"wolfssl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.0-3","5.0.0-1","5.1.1-1","5.2.0-1","5.2.0-2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"wolfssl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.5.4-2","5.5.4-2.1","5.6.4-2","5.6.6-1.2","5.6.6-1.3","5.6.6-1.3build1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"wolfssl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.7.2-0.1"]}],"products":[{"vendor":"wolfssl","product":"wolfssl"}],"references":[{"url":"https://github.com/wolfSSL/wolfssl/pull/10116","tags":["patch","Issue Tracking","Patch","fix","web","report"]},{"url":"https://www.wolfssl.com/docs/security-vulnerabilities/","tags":["Vendor Advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6681","tags":["advisory","web"]},{"url":"https://www.wolfssl.com/docs/security-vulnerabilities","tags":["web"]},{"url":"https://github.com/advisories/GHSA-6q89-vxvr-wgv2","tags":["web"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-6681","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6681.json","tags":["advisory"]},{"url":"https://github.com/wolfSSL/wolfssl","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-6681","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-6681","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-6681","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-6681","title":"PKCS#7 decode ignores caller output buffer size, writing past buffer bounds","description":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.","status":"published","published":"2026-06-25T20:11:39.446Z","modified":"2026-06-26T13:14:09.177Z","cvss":[{"version":"4.0","score":1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/U:Clear","level":"low","assessor":"cna"}],"cwes":["CWE-787","CWE-120"],"updated_at":"2026-11-02T13:50:04.986624Z"}],"euvd":[{"id":"EUVD-2026-39556","description":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.","status":"published","published":"2026-06-25T20:11:39Z","modified":"2026-06-26T13:14:09Z","cvss":[{"version":"4.0","score":1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/U:Clear","level":"low"}],"updated_at":"2026-11-02T18:20:24.957062Z"}],"ghsa":[{"id":"GHSA-6q89-vxvr-wgv2","title":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing...","description":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.","status":"published","published":"2026-06-25T21:31:32Z","modified":"2026-06-27T21:30:27Z","cvss":[{"version":"4.0","score":1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Clear","level":"low"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T15:09:01.878033Z"}],"nvd":[{"id":"CVE-2026-6681","description":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.","status":"published","published":"2026-06-25T21:16:28.283Z","modified":"2026-06-27T20:02:40.84Z","cvss":[{"version":"4.0","score":1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Clear","level":"low","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-120","CWE-787"],"updated_at":"2026-11-02T14:12:26.045561Z"}],"osv":[{"id":"ALPINE-CVE-2026-6681","description":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.","status":"published","published":"2026-06-25T21:16:28.283Z","modified":"2026-11-03T06:33:03.903376805Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T07:15:37.282377Z"},{"id":"CVE-2026-6681","title":"PKCS#7 decode ignores caller output buffer size, writing past buffer bounds","description":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.","status":"published","published":"2026-06-25T20:11:39.446Z","modified":"2026-10-28T02:31:04.850874802Z","cvss":[{"version":"4.0","score":1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/U:Clear","level":"low"}],"cwes":["CWE-120","CWE-787"],"updated_at":"2026-11-02T15:45:14.46177Z"},{"id":"DEBIAN-CVE-2026-6681","description":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.","status":"published","published":"2026-06-25T21:16:28.283Z","modified":"2026-10-01T03:03:48.253602432Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:58.699079Z"},{"id":"JLSEC-2026-754","title":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded...","description":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.","status":"published","published":"2026-07-14T21:41:35.775Z","modified":"2026-07-25T18:24:01.49522439Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"},{"version":"4.0","score":1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Clear","level":"low"}],"updated_at":"2026-11-02T15:47:19.003546Z"},{"id":"UBUNTU-CVE-2026-6681","description":"The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.","status":"published","published":"2026-06-25T21:16:00Z","modified":"2026-06-29T23:19:16.599596082Z","cvss":[{"version":"4.0","score":1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/U:Clear","level":"low"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:53.710209Z"}]}}