CVE-2026-34180

CVE-2026-34180

Name

CVE-2026-34180

Description

Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive element whose content exceeds 2 gigabytes in length may cause a heap buffer over-read on 64-bit Unix and Unix-like platforms. Impact summary: The heap buffer over-read may crash the application (Denial of Service) or to load into the decoded ASN.1 object contents of memory beyond the end of the input buffer. More typically such ASN.1 elements would instead be truncated. An integer truncation in OpenSSL's ASN.1 decoder causes the content length of an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the worst case the truncated length is treated as a request to scan the binary content for a terminating zero byte, possibly causing OpenSSL to read either less than or beyond the end of the allocated buffer. Applications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or any other d2i_* decoding function are affected. OpenSSL's own command-line tools are not vulnerable, as data read through the BIO layer is checked before it reaches the affected code. The issue only affects 64-bit Unix and Unix-like platforms; 32-bit platforms and 64-bit Windows are not affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

NVD Severity

unknown

Other trackers

CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia

Mailing lists

oss-security, full-disclosure, bugtraq

Exploits

Exploit DB, Metasploit

Forges

GitHub (code, issues), Aports (code, issues)

Type	URI
openssl-security@openssl.org	https://github.com/openssl/security/commit/1c6908e4fa5fa568752221d8eaf561a809751e5d
openssl-security@openssl.org	https://github.com/openssl/security/commit/cbe418ae978539cf14a398a207dba834c0e93e83
openssl-security@openssl.org	https://github.com/openssl/security/commit/d93853c42110d6319e3df07842b488cb9f7ac5ff
openssl-security@openssl.org	https://github.com/openssl/security/commit/da5d62af75f69d6fbf7803743d7c56ac75461e43
openssl-security@openssl.org	https://github.com/openssl/security/commit/f696c73c3e61b8c502d040af62e690c060908a16
openssl-security@openssl.org	https://openssl-library.org/news/secadv/20260609.txt
openssl-security@openssl.org	https://github.com/openssl/openssl/commit/1c6908e4fa5fa568752221d8eaf561a809751e5d
openssl-security@openssl.org	https://github.com/openssl/openssl/commit/cbe418ae978539cf14a398a207dba834c0e93e83
openssl-security@openssl.org	https://github.com/openssl/openssl/commit/d93853c42110d6319e3df07842b488cb9f7ac5ff
openssl-security@openssl.org	https://github.com/openssl/openssl/commit/da5d62af75f69d6fbf7803743d7c56ac75461e43
openssl-security@openssl.org	https://github.com/openssl/openssl/commit/f696c73c3e61b8c502d040af62e690c060908a16

Type

URI

openssl-security@openssl.org

https://github.com/openssl/security/commit/1c6908e4fa5fa568752221d8eaf561a809751e5d

openssl-security@openssl.org

https://github.com/openssl/security/commit/cbe418ae978539cf14a398a207dba834c0e93e83

openssl-security@openssl.org

https://github.com/openssl/security/commit/d93853c42110d6319e3df07842b488cb9f7ac5ff

openssl-security@openssl.org

https://github.com/openssl/security/commit/da5d62af75f69d6fbf7803743d7c56ac75461e43

openssl-security@openssl.org

https://github.com/openssl/security/commit/f696c73c3e61b8c502d040af62e690c060908a16

openssl-security@openssl.org

https://openssl-library.org/news/secadv/20260609.txt

openssl-security@openssl.org

https://github.com/openssl/openssl/commit/1c6908e4fa5fa568752221d8eaf561a809751e5d

openssl-security@openssl.org

https://github.com/openssl/openssl/commit/cbe418ae978539cf14a398a207dba834c0e93e83

openssl-security@openssl.org

https://github.com/openssl/openssl/commit/d93853c42110d6319e3df07842b488cb9f7ac5ff

openssl-security@openssl.org

https://github.com/openssl/openssl/commit/da5d62af75f69d6fbf7803743d7c56ac75461e43

openssl-security@openssl.org

https://github.com/openssl/openssl/commit/f696c73c3e61b8c502d040af62e690c060908a16

Match rules

CPE URI	Source package	Min version	Max version
`cpe:2.3:a:openssl:openssl::::::::`	openssl	>= 1.0.2	< 1.0.2zq
`cpe:2.3:a:openssl:openssl::::::::`	openssl	>= 1.1.1	< 1.1.1zh
`cpe:2.3:a:openssl:openssl::::::::`	openssl	>= 3.0.0	< 3.0.21
`cpe:2.3:a:openssl:openssl::::::::`	openssl	>= 3.4.0	< 3.4.6
`cpe:2.3:a:openssl:openssl::::::::`	openssl	>= 3.5.0	< 3.5.7
`cpe:2.3:a:openssl:openssl::::::::`	openssl	>= 3.6.0	< 3.6.3
`cpe:2.3:a:openssl:openssl:4.0.0:-::::::`	openssl	== None	== 4.0.0

CPE URI

Source package

Min version

Max version