{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/96982?format=json","vulnerability_id":"VCID-h6na-nxxq-5yg9","summary":"A stack buffer overflow vulnerability exists in wolfSSL's PKCS7 SignedData encoding functionality. In wc_PKCS7_BuildSignedAttributes(), when adding custom signed attributes, the code passes an incorrect capacity value (esd->signedAttribsCount) to EncodeAttributes() instead of the remaining available space in the fixed-size signedAttribs[7] array. When an application sets pkcs7->signedAttribsSz to a value greater than MAX_SIGNED_ATTRIBS_SZ (default 7) minus the number of default attributes already added, EncodeAttributes() writes beyond the array bounds, causing stack memory corruption. In WOLFSSL_SMALL_STACK builds, this becomes heap corruption. Exploitation requires an application that allows untrusted input to control the signedAttribs array size when calling wc_PKCS7_EncodeSignedData() or related signing functions.","aliases":[{"alias":"CVE-2026-0819"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/942915?format=json","purl":"pkg:deb/debian/wolfssl@5.9.0-0.1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/wolfssl@5.9.0-0.1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/994704?format=json","purl":"pkg:deb/debian/wolfssl@5.9.0-0.2","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/wolfssl@5.9.0-0.2"},{"url":"http://public2.vulnerablecode.io/api/packages/942886?format=json","purl":"pkg:deb/debian/wolfssl@5.9.0-0.2?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/wolfssl@5.9.0-0.2%3Fdistro=trixie"}],"affected_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/994671?format=json","purl":"pkg:deb/debian/wolfssl@4.6.0%2Bp1-0%2Bdeb11u2","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-1u3q-52yd-1bhe"},{"vulnerability":"VCID-24s5-d6jt-4kfe"},{"vulnerability":"VCID-2ry7-trrg-gfdk"},{"vulnerability":"VCID-47nm-nte5-27fm"},{"vulnerability":"VCID-4zda-zrq6-hbc8"},{"vulnerability":"VCID-6n4g-us9a-53g4"},{"vulnerability":"VCID-6v8z-cfax-zqbh"},{"vulnerability":"VCID-7xbp-qkvv-bqgm"},{"vulnerability":"VCID-8735-ectc-j7a3"},{"vulnerability":"VCID-9hdy-aqa2-w3bd"},{"vulnerability":"VCID-9jpj-dfsf-qkce"},{"vulnerability":"VCID-9jw2-3v9v-ruap"},{"vulnerability":"VCID-9kev-ferz-5bhr"},{"vulnerability":"VCID-9x14-2t7m-1kbm"},{"vulnerability":"VCID-cum2-vp1j-syfc"},{"vulnerability":"VCID-cxhw-3w24-dkes"},{"vulnerability":"VCID-dpu2-4w42-kygw"},{"vulnerability":"VCID-euma-vgqx-sbau"},{"vulnerability":"VCID-f4gq-hqcp-dqe2"},{"vulnerability":"VCID-f57c-kamk-3bct"},{"vulnerability":"VCID-fmtp-x6y7-83g1"},{"vulnerability":"VCID-gcfd-w8je-kqfm"},{"vulnerability":"VCID-gdur-h588-vbb6"},{"vulnerability":"VCID-gmdj-a1ys-tqc2"},{"vulnerability":"VCID-h6na-nxxq-5yg9"},{"vulnerability":"VCID-hk8r-kk4v-1fa7"},{"vulnerability":"VCID-jxf4-y1au-5bhw"},{"vulnerability":"VCID-khur-3ax7-9fhb"},{"vulnerability":"VCID-n64w-nq6a-m7bv"},{"vulnerability":"VCID-njbj-f91t-b7f4"},{"vulnerability":"VCID-su8x-6n42-n3d5"},{"vulnerability":"VCID-u24a-2khf-uyba"},{"vulnerability":"VCID-uvht-9bt9-hfbb"},{"vulnerability":"VCID-v3m6-zajw-bfhb"},{"vulnerability":"VCID-xfgd-4hs3-vygk"},{"vulnerability":"VCID-xuyn-pjpb-g7du"},{"vulnerability":"VCID-xxkx-w5pc-5uap"},{"vulnerability":"VCID-zhf4-y8v8-gubn"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/wolfssl@4.6.0%252Bp1-0%252Bdeb11u2"},{"url":"http://public2.vulnerablecode.io/api/packages/942885?format=json","purl":"pkg:deb/debian/wolfssl@4.6.0%2Bp1-0%2Bdeb11u2?distro=trixie","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-1u3q-52yd-1bhe"},{"vulnerability":"VCID-24s5-d6jt-4kfe"},{"vulnerability":"VCID-2ry7-trrg-gfdk"},{"vulnerability":"VCID-47nm-nte5-27fm"},{"vulnerability":"VCID-4zda-zrq6-hbc8"},{"vulnerability":"VCID-6n4g-us9a-53g4"},{"vulnerability":"VCID-6v8z-cfax-zqbh"},{"vulnerability":"VCID-7xbp-qkvv-bqgm"},{"vulnerability":"VCID-8735-ectc-j7a3"},{"vulnerability":"VCID-9hdy-aqa2-w3bd"},{"vulnerability":"VCID-9jpj-dfsf-qkce"},{"vulnerability":"VCID-9jw2-3v9v-ruap"},{"vulnerability":"VCID-9kev-ferz-5bhr"},{"vulnerability":"VCID-9x14-2t7m-1kbm"},{"vulnerability":"VCID-cum2-vp1j-syfc"},{"vulnerability":"VCID-cxhw-3w24-dkes"},{"vulnerability":"VCID-dpu2-4w42-kygw"},{"vulnerability":"VCID-euma-vgqx-sbau"},{"vulnerability":"VCID-f4gq-hqcp-dqe2"},{"vulnerability":"VCID-f57c-kamk-3bct"},{"vulnerability":"VCID-fmtp-x6y7-83g1"},{"vulnerability":"VCID-gcfd-w8je-kqfm"},{"vulnerability":"VCID-gdur-h588-vbb6"},{"vulnerability":"VCID-gmdj-a1ys-tqc2"},{"vulnerability":"VCID-h6na-nxxq-5yg9"},{"vulnerability":"VCID-hk8r-kk4v-1fa7"},{"vulnerability":"VCID-jxf4-y1au-5bhw"},{"vulnerability":"VCID-khur-3ax7-9fhb"},{"vulnerability":"VCID-n64w-nq6a-m7bv"},{"vulnerability":"VCID-njbj-f91t-b7f4"},{"vulnerability":"VCID-su8x-6n42-n3d5"},{"vulnerability":"VCID-u24a-2khf-uyba"},{"vulnerability":"VCID-uvht-9bt9-hfbb"},{"vulnerability":"VCID-v3m6-zajw-bfhb"},{"vulnerability":"VCID-xfgd-4hs3-vygk"},{"vulnerability":"VCID-xuyn-pjpb-g7du"},{"vulnerability":"VCID-xxkx-w5pc-5uap"},{"vulnerability":"VCID-zhf4-y8v8-gubn"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/wolfssl@4.6.0%252Bp1-0%252Bdeb11u2%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/994672?format=json","purl":"pkg:deb/debian/wolfssl@5.5.4-2%2Bdeb12u2","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-1u3q-52yd-1bhe"},{"vulnerability":"VCID-24s5-d6jt-4kfe"},{"vulnerability":"VCID-2ry7-trrg-gfdk"},{"vulnerability":"VCID-47nm-nte5-27fm"},{"vulnerability":"VCID-4zda-zrq6-hbc8"},{"vulnerability":"VCID-6v8z-cfax-zqbh"},{"vulnerability":"VCID-7xbp-qkvv-bqgm"},{"vulnerability":"VCID-8735-ectc-j7a3"},{"vulnerability":"VCID-9hdy-aqa2-w3bd"},{"vulnerability":"VCID-9jpj-dfsf-qkce"},{"vulnerability":"VCID-9jw2-3v9v-ruap"},{"vulnerability":"VCID-9kev-ferz-5bhr"},{"vulnerability":"VCID-9x14-2t7m-1kbm"},{"vulnerability":"VCID-cxhw-3w24-dkes"},{"vulnerability":"VCID-dpu2-4w42-kygw"},{"vulnerability":"VCID-euma-vgqx-sbau"},{"vulnerability":"VCID-f57c-kamk-3bct"},{"vulnerability":"VCID-fmtp-x6y7-83g1"},{"vulnerability":"VCID-gcfd-w8je-kqfm"},{"vulnerability":"VCID-gdur-h588-vbb6"},{"vulnerability":"VCID-gmdj-a1ys-tqc2"},{"vulnerability":"VCID-h6na-nxxq-5yg9"},{"vulnerability":"VCID-hk8r-kk4v-1fa7"},{"vulnerability":"VCID-jxf4-y1au-5bhw"},{"vulnerability":"VCID-khur-3ax7-9fhb"},{"vulnerability":"VCID-n64w-nq6a-m7bv"},{"vulnerability":"VCID-njbj-f91t-b7f4"},{"vulnerability":"VCID-su8x-6n42-n3d5"},{"vulnerability":"VCID-u24a-2khf-uyba"},{"vulnerability":"VCID-uvht-9bt9-hfbb"},{"vulnerability":"VCID-v3m6-zajw-bfhb"},{"vulnerability":"VCID-xfgd-4hs3-vygk"},{"vulnerability":"VCID-xuyn-pjpb-g7du"},{"vulnerability":"VCID-xxkx-w5pc-5uap"},{"vulnerability":"VCID-zhf4-y8v8-gubn"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/wolfssl@5.5.4-2%252Bdeb12u2"},{"url":"http://public2.vulnerablecode.io/api/packages/942883?format=json","purl":"pkg:deb/debian/wolfssl@5.5.4-2%2Bdeb12u2?distro=trixie","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-1u3q-52yd-1bhe"},{"vulnerability":"VCID-24s5-d6jt-4kfe"},{"vulnerability":"VCID-2ry7-trrg-gfdk"},{"vulnerability":"VCID-47nm-nte5-27fm"},{"vulnerability":"VCID-4zda-zrq6-hbc8"},{"vulnerability":"VCID-6v8z-cfax-zqbh"},{"vulnerability":"VCID-7xbp-qkvv-bqgm"},{"vulnerability":"VCID-8735-ectc-j7a3"},{"vulnerability":"VCID-9hdy-aqa2-w3bd"},{"vulnerability":"VCID-9jpj-dfsf-qkce"},{"vulnerability":"VCID-9jw2-3v9v-ruap"},{"vulnerability":"VCID-9kev-ferz-5bhr"},{"vulnerability":"VCID-9x14-2t7m-1kbm"},{"vulnerability":"VCID-cxhw-3w24-dkes"},{"vulnerability":"VCID-dpu2-4w42-kygw"},{"vulnerability":"VCID-euma-vgqx-sbau"},{"vulnerability":"VCID-f57c-kamk-3bct"},{"vulnerability":"VCID-fmtp-x6y7-83g1"},{"vulnerability":"VCID-gcfd-w8je-kqfm"},{"vulnerability":"VCID-gdur-h588-vbb6"},{"vulnerability":"VCID-gmdj-a1ys-tqc2"},{"vulnerability":"VCID-h6na-nxxq-5yg9"},{"vulnerability":"VCID-hk8r-kk4v-1fa7"},{"vulnerability":"VCID-jxf4-y1au-5bhw"},{"vulnerability":"VCID-khur-3ax7-9fhb"},{"vulnerability":"VCID-n64w-nq6a-m7bv"},{"vulnerability":"VCID-njbj-f91t-b7f4"},{"vulnerability":"VCID-su8x-6n42-n3d5"},{"vulnerability":"VCID-u24a-2khf-uyba"},{"vulnerability":"VCID-uvht-9bt9-hfbb"},{"vulnerability":"VCID-v3m6-zajw-bfhb"},{"vulnerability":"VCID-xfgd-4hs3-vygk"},{"vulnerability":"VCID-xuyn-pjpb-g7du"},{"vulnerability":"VCID-xxkx-w5pc-5uap"},{"vulnerability":"VCID-zhf4-y8v8-gubn"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/wolfssl@5.5.4-2%252Bdeb12u2%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/942887?format=json","purl":"pkg:deb/debian/wolfssl@5.7.2-0.1%2Bdeb13u1?distro=trixie","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-2ry7-trrg-gfdk"},{"vulnerability":"VCID-4zda-zrq6-hbc8"},{"vulnerability":"VCID-6v8z-cfax-zqbh"},{"vulnerability":"VCID-8735-ectc-j7a3"},{"vulnerability":"VCID-9jpj-dfsf-qkce"},{"vulnerability":"VCID-9jw2-3v9v-ruap"},{"vulnerability":"VCID-9kev-ferz-5bhr"},{"vulnerability":"VCID-9x14-2t7m-1kbm"},{"vulnerability":"VCID-cxhw-3w24-dkes"},{"vulnerability":"VCID-f57c-kamk-3bct"},{"vulnerability":"VCID-fmtp-x6y7-83g1"},{"vulnerability":"VCID-gcfd-w8je-kqfm"},{"vulnerability":"VCID-gdur-h588-vbb6"},{"vulnerability":"VCID-gmdj-a1ys-tqc2"},{"vulnerability":"VCID-h6na-nxxq-5yg9"},{"vulnerability":"VCID-hk8r-kk4v-1fa7"},{"vulnerability":"VCID-jxf4-y1au-5bhw"},{"vulnerability":"VCID-khur-3ax7-9fhb"},{"vulnerability":"VCID-n64w-nq6a-m7bv"},{"vulnerability":"VCID-njbj-f91t-b7f4"},{"vulnerability":"VCID-uvht-9bt9-hfbb"},{"vulnerability":"VCID-v3m6-zajw-bfhb"},{"vulnerability":"VCID-xuyn-pjpb-g7du"},{"vulnerability":"VCID-xxkx-w5pc-5uap"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/wolfssl@5.7.2-0.1%252Bdeb13u1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/994673?format=json","purl":"pkg:deb/debian/wolfssl@5.7.2-0.1%2Bdeb13u1","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-2ry7-trrg-gfdk"},{"vulnerability":"VCID-4zda-zrq6-hbc8"},{"vulnerability":"VCID-6v8z-cfax-zqbh"},{"vulnerability":"VCID-8735-ectc-j7a3"},{"vulnerability":"VCID-9jpj-dfsf-qkce"},{"vulnerability":"VCID-9jw2-3v9v-ruap"},{"vulnerability":"VCID-9kev-ferz-5bhr"},{"vulnerability":"VCID-9x14-2t7m-1kbm"},{"vulnerability":"VCID-cxhw-3w24-dkes"},{"vulnerability":"VCID-f57c-kamk-3bct"},{"vulnerability":"VCID-fmtp-x6y7-83g1"},{"vulnerability":"VCID-gcfd-w8je-kqfm"},{"vulnerability":"VCID-gdur-h588-vbb6"},{"vulnerability":"VCID-gmdj-a1ys-tqc2"},{"vulnerability":"VCID-h6na-nxxq-5yg9"},{"vulnerability":"VCID-hk8r-kk4v-1fa7"},{"vulnerability":"VCID-jxf4-y1au-5bhw"},{"vulnerability":"VCID-khur-3ax7-9fhb"},{"vulnerability":"VCID-n64w-nq6a-m7bv"},{"vulnerability":"VCID-njbj-f91t-b7f4"},{"vulnerability":"VCID-uvht-9bt9-hfbb"},{"vulnerability":"VCID-v3m6-zajw-bfhb"},{"vulnerability":"VCID-xuyn-pjpb-g7du"},{"vulnerability":"VCID-xxkx-w5pc-5uap"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/wolfssl@5.7.2-0.1%252Bdeb13u1"}],"references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-0819","reference_id":"","reference_type":"","scores":[{"value":"0.00022","scoring_system":"epss","scoring_elements":"0.05944","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00022","scoring_system":"epss","scoring_elements":"0.05953","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00022","scoring_system":"epss","scoring_elements":"0.05879","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00022","scoring_system":"epss","scoring_elements":"0.05912","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00022","scoring_system":"epss","scoring_elements":"0.05904","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00022","scoring_system":"epss","scoring_elements":"0.05942","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00022","scoring_system":"epss","scoring_elements":"0.05981","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00022","scoring_system":"epss","scoring_elements":"0.05962","published_at":"2026-04-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-0819"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-0819","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-0819"},{"reference_url":"https://github.com/wolfSSL/wolfssl/pull/9630","reference_id":"9630","reference_type":"","scores":[{"value":"2.2","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-03-19T17:19:26Z/"}],"url":"https://github.com/wolfSSL/wolfssl/pull/9630"}],"weaknesses":[{"cwe_id":121,"name":"Stack-based Buffer Overflow","description":"A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function)."},{"cwe_id":787,"name":"Out-of-bounds Write","description":"The product writes data past the end, or before the beginning, of the intended buffer."}],"exploits":[],"severity_range_score":"2.2 - 2.2","exploitability":"0.5","weighted_severity":"2.0","risk_score":1.0,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-h6na-nxxq-5yg9"}