{"cve":"CVE-2022-4450","nvd":{"published":"2023-02-08T20:15:23.973","modified":"2026-10-14T15:17:00.197","status":"Modified","description":"The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and\ndecodes the \"name\" (e.g. \"CERTIFICATE\"), any header data and the payload data.\nIf the function succeeds then the \"name_out\", \"header\" and \"data\" arguments are\npopulated with pointers to buffers containing the relevant decoded data. The\ncaller is responsible for freeing those buffers. It is possible to construct a\nPEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex()\nwill return a failure code but will populate the header argument with a pointer\nto a buffer that has already been freed. If the caller also frees this buffer\nthen a double free will occur. This will most likely lead to a crash. This\ncould be exploited by an attacker who has the ability to supply malicious PEM\nfiles for parsing to achieve a denial of service attack.\n\nThe functions PEM_read_bio() and PEM_read() are simple wrappers around\nPEM_read_bio_ex() and therefore these functions are also directly affected.\n\nThese functions are also called indirectly by a number of other OpenSSL\nfunctions including PEM_X509_INFO_read_bio_ex() and\nSSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal\nuses of these functions are not vulnerable because the caller does not free the\nheader argument if PEM_read_bio_ex() returns a failure code. These locations\ninclude the PEM_read_bio_TYPE() functions as well as the decoders introduced in\nOpenSSL 3.0.\n\nThe OpenSSL asn1parse command line application is also impacted by this issue.","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-415"],"references":["https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=63bcf189be73a9cc1264059bed6f57974be74a83","https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=bbcf509bd046b34cca19c766bbddc31683d0858b","https://security.gentoo.org/glsa/202402-08","https://www.openssl.org/news/secadv/20230207.txt","https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=63bcf189be73a9cc1264059bed6f57974be74a83"],"products":["openssl:openssl","stormshield:stormshield_network_security"],"source":"nvd","synced_at":"2026-10-19T21:37:38.595364862+00:00"},"epss":{"cve":"CVE-2022-4450","score":0.2859,"percentile":0.98121,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-v5w6-wcm8-jm4q","url":"https://osv.dev/vulnerability/GHSA-v5w6-wcm8-jm4q","summary":"openssl-src contains Double free after calling `PEM_read_bio_ex`","modified":"2026-09-10T03:49:52.172683553Z","packages":[{"ecosystem":"crates.io","name":"openssl-src","purl":"pkg:cargo/openssl-src","ranges":["<111.25.0"],"fixed":["111.25.0"]},{"ecosystem":"crates.io","name":"openssl-src","purl":"pkg:cargo/openssl-src","ranges":[">=300.0.0 <300.0.12"],"fixed":["300.0.12"]}]},{"id":"RUSTSEC-2023-0010","url":"https://osv.dev/vulnerability/RUSTSEC-2023-0010","summary":"Double free after calling `PEM_read_bio_ex`","modified":"2023-11-08T04:10:48.273182Z","packages":[{"ecosystem":"crates.io","name":"openssl-src","purl":"pkg:cargo/openssl-src","ranges":[">=0.0.0-0 <111.25.0",">=300.0.0 <300.0.12"],"fixed":["111.25.0","300.0.12"]}]}],"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."]}