CVE-2026-34180

描述

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.

如何修補 CVE-2026-34180

要修補 CVE-2026-34180,請將受影響套件升級到下列已修補版本。

• —升級至 3.5.7-r0 或更新版本
• —未列出修補版本

CVE-2026-34180 正在被利用嗎?

目前沒有被利用訊號。CVE-2026-34180 既不在 CISA KEV 也沒有最新的 EPSS 分數。

受影響套件(2)

• from 0, < 3.5.7-r0
• from 0

CVSS 分數

參考連結(2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2026-34180
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2026-34180