Code execution via signed attribute-length overflow
Published May 17, 2026 · Updated May 17, 2026
An out-of-bounds write in Crypt::OpenSSL::PKCS12 1.94 and earlier allows remote attackers to execute code via a crafted PKCS12 file. In PKCS12.xs, print_attribute multiplies an attacker-controlled OCTET STRING or BIT STRING length by four as a signed int, so Renew allocates a near-empty heap buffer before get_hex writes roughly 3 GiB past it. Exploitation requires an application to parse an untrusted bundle and call info() or info_as_hash(); resulting code runs with that process's privileges.
Summary
What happened
An out-of-bounds write in Crypt::OpenSSL::PKCS12 1.94 and earlier allows remote attackers to execute code via a crafted PKCS12 file. In PKCS12.xs, print_attribute multiplies an attacker-controlled OCTET STRING or BIT STRING length by four as a signed int, so Renew allocates a near-empty heap buffer before get_hex writes roughly 3 GiB past it. Exploitation requires an application to parse an untrusted bundle and call info() or info_as_hash(); resulting code runs with that process's privileges.
The record
- CVE
- CVE-2026-8507
- Published
- May 17, 2026
- Updated
- May 17, 2026
- Vendor
- Jonas B. Nielsen
- Product
- Crypt::OpenSSL::PKCS12
- Classifications
- CWE-787
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 17, 2026CVE publishedPublication date reported by the CVE source.
- May 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <=1.94
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
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Your stack
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