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CVE-2026-44518— liboqs: XMSS Buffer Overread Bug

Quick assessment

Affected
open-quantum-safe liboqs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

liboqs是Open Quantum Safe开源的一个用于量子安全加密算法的开源 C 库。 liboqs 0.16.0之前版本存在缓冲区错误漏洞，该漏洞源于XMSS和XMSS^MT状态签名验证代码中，当使用短于预期签名大小的签名缓冲区调用验证函数时，实现未验证调用者提供的长度并读取缓冲区末尾，可能导致验证进程崩溃。

CVSS 5.3 · Medium EPSS 0.30% · P23

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-quantum-safe liboqs < 0.16.0 affected
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I. Basic Information for CVE-2026-44518

Vulnerability Information
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Vulnerability Title
liboqs: XMSS Buffer Overread Bug
Source: CVE Program / CVE List V5
Vulnerability Description
liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. Prior to 0.16.0, an out-of-bounds read has been identified in the XMSS and XMSS^MT stateful signature verification code. When the verification function is called with a signature buffer shorter than the expected signature size for the given parameter set, the implementation does not validate the caller-supplied length and proceeds to read past the end of the buffer. The out-of-bounds bytes are consumed only as input to an internal hash computation and are not returned to the caller, so no oracle exists to leak their contents to an attacker. The primary observable effect is a possible crash (denial of service) of the verifying process if the read crosses into an unmapped memory page. This vulnerability is fixed in 0.16.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
liboqs 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
liboqs是Open Quantum Safe开源的一个用于量子安全加密算法的开源 C 库。 liboqs 0.16.0之前版本存在缓冲区错误漏洞，该漏洞源于XMSS和XMSS^MT状态签名验证代码中，当使用短于预期签名大小的签名缓冲区调用验证函数时，实现未验证调用者提供的长度并读取缓冲区末尾，可能导致验证进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-quantum-safe liboqs < 0.16.0 -

II. Public POCs for CVE-2026-44518

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III. Intelligence Information for CVE-2026-44518

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Vendor Advisories for CVE-2026-44518 (1)

IV. Related Vulnerabilities

Same product: liboqs
Same vendor: open-quantum-safe
Same weakness: CWE-20

V. Comments for CVE-2026-44518

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