PT-2026-31864 · Wolfssl · Wolfssl

CVE-2026-5500 · Published 2026-04-10 · Updated 2026-07-14

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions wolfSSL (affected versions not specified)

Description wolfSSL's wc PKCS7 DecodeAuthEnvelopedData() function does not properly sanitize the AES-GCM authentication tag length received and lacks a lower bounds check. This allows a man-in-the-middle attacker to truncate the message authentication code (MAC) field, reducing the tag check from 2⁻¹²⁸ to 2⁻⁸.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-5500

JLSEC-2026-729

Affected Products

Wolfssl

References · 13

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5500.json · Exploit
• https://ubuntu.com/security/CVE-2026-5500 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-5500 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5500 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-5500 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-5500 · Vendor Advisory
• https://osv.dev/vulnerability/JLSEC-2026-729 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-5500 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-5500 · Vendor Advisory
• https://github.com/wolfSSL/wolfssl/pull/10102 · Note
• https://twitter.com/CVEnew/status/2042561777033162852 · Twitter Post
• https://github.com/advisories/GHSA-m77r-vqw2-hffx · Note
• https://twitter.com/CVEarity/status/2042917989763420241 · Twitter Post