Cyber Resilience

CVE-2026-8507

Critical

Published: 17 May 2026

Published
17 May 2026
Modified
18 May 2026
KEV Added
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Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0065 46.5th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-8507 is a critical-severity Out-of-bounds Write (CWE-787) vulnerability. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 46.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Crypt::OpenSSL::PKCS12 versions through 1.94 for Perl have out-of-bounds (OOB) write flaws. When parsing a PKCS12 file, with a >= 1 GiB OCTET STRING (or BIT STRING) attribute on a SAFEBAG, via info() or info_as_hash(), a heap out-of-bounds write would be…

more

triggered with remote-code-execution potential (RCE) due to a signed integer overflow in the size calculation passed to Renew().

CWE(s)
CWE-787

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
Why these techniques?

OOB write in PKCS12 parsing enables RCE on malicious file input to affected Perl apps/services.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-27648Shared CWE-787
CVE-2026-40493Shared CWE-787
CVE-2026-31789Shared CWE-787
CVE-2026-40492Shared CWE-787
CVE-2025-69419Shared CWE-787
CVE-2024-53842Shared CWE-787
CVE-2019-25705Shared CWE-787
CVE-2019-25633Shared CWE-787
CVE-2025-27807Shared CWE-787
CVE-2026-0538Shared CWE-787

Affected Assets

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PKCS12
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-787

Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.

References