How severe is CVE-2026-5460?

CVE-2026-5460 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2026-5460 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5460?

CVE-2026-5460 affects Wolfssl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5460?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-5460 have an EU (EUVD) identifier?

Yes. CVE-2026-5460 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21240.

When was CVE-2026-5460 published?

CVE-2026-5460 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-5460

CVE-2026-5460 is a medium-severity vulnerability in Wolfssl with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 6.3
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21240
Weakness: CWE-416
Affected product: Wolfssl
Published: 2026-04-10
Last modified: 2026-06-17

Description

A heap use-after-free exists in wolfSSL's TLS 1.3 post-quantum cryptography (PQC) hybrid KeyShare processing. In the error handling path of TLSX_KeyShare_ProcessPqcHybridClient() in src/tls.c, the inner function TLSX_KeyShare_ProcessPqcClient_ex() frees a KyberKey object upon encountering an error. The caller then invokes TLSX_KeyShare_FreeAll(), which attempts to call ForceZero() on the already-freed KyberKey, resulting in writes of zero bytes over freed heap memory.

Frequently asked questions

What is CVE-2026-5460?: A heap use-after-free exists in wolfSSL's TLS 1.3 post-quantum cryptography (PQC) hybrid KeyShare processing. In the error handling path of TLSX_KeyShare_ProcessPqcHybridClient() in src/tls.c, the inner function TLSX_KeyShare_ProcessPqcClient_ex() frees a KyberKey object upon encountering an error. The caller then invokes TLSX_KeyShare_FreeAll(), which attempts to call ForceZero() on the already-freed KyberKey, resulting in writes of zero bytes over freed heap memory.
How severe is CVE-2026-5460?: CVE-2026-5460 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2026-5460 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5460?: CVE-2026-5460 affects Wolfssl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5460?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5460 have an EU (EUVD) identifier?: Yes. CVE-2026-5460 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21240.
When was CVE-2026-5460 published?: CVE-2026-5460 was published on 2026-04-10 and last updated on 2026-06-17.

References

https://github.com/wolfssl/wolfssl/pull/10092

Affected products (1)

cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*

More vulnerabilities in Wolfssl

CVE-2026-7531 — Critical (CVSS 9.8): Use-after-free in PQC hybrid key-share handling. This is an incomplete-fix follow-up to CVE-2026-5460 (released in…
CVE-2026-5264 — Critical (CVSS 9.8): Heap buffer overflow in DTLS 1.3 ACK message processing. A remote attacker can send a crafted DTLS 1.3 ACK message that…
CVE-2026-5187 — Critical (CVSS 9.8): Two potential heap out-of-bounds write locations existed in DecodeObjectId() in wolfcrypt/src/asn.c. First, a bounds…
CVE-2026-4395 — Critical (CVSS 9.8): Heap-based buffer overflow in the KCAPI ECC code path of wc_ecc_import_x963_ex() in wolfSSL wolfcrypt allows a remote…
CVE-2026-3849 — Critical (CVSS 9.8): Stack Buffer Overflow in wc_HpkeLabeledExtract via Oversized ECH Config. A vulnerability existed in wolfSSL 5.8.4 ECH…
CVE-2026-3549 — Critical (CVSS 9.8): Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a…

All CVEs affecting Wolfssl →

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CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…

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