🛡️ JLSEC-2026-674 — wolfssl-jll
Description
In wolfSSL before 5.5.2, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS 1.3 client or network attacker can trigger a buffer over-read on the heap of 5 bytes. (WOLFSSL_CALLBACKS is only intended for debugging.)
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability high.
Affected software
JLSEC-2026-674 is recorded against 1 package.
- wolfssl-jll
Timeline and source
Published on 14 July 2026 and last revised on 25 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
packetstormsecurity.com (Web)
seclists.org (Web)
blog.trailofbits.com (Web)
github.com (Web)
github.com (Web)
www.wolfssl.com (Web)
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| wolfssl-jll | — | — |
Similar Threats
- Unknown JLSEC-2026-668
- Unknown JLSEC-2026-669
- Unknown JLSEC-2026-670
- Unknown JLSEC-2026-671
- Unknown JLSEC-2026-672
More JLSEC 2026 advisories
Browse all of JLSEC 2026 in the advisory index.
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