How severe is CVE-2026-5392?

CVE-2026-5392 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2026-5392 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5392?

CVE-2026-5392 affects Wolfssl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5392?

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

Does CVE-2026-5392 have an EU (EUVD) identifier?

Yes. CVE-2026-5392 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21229.

When was CVE-2026-5392 published?

CVE-2026-5392 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-5392

CVE-2026-5392 is a medium-severity vulnerability in Wolfssl with a CVSS 3.x base score of 5.4. 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-125.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 2.3
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21229
Weakness: CWE-125
Affected product: Wolfssl
Published: 2026-04-10
Last modified: 2026-06-17

Description

Heap out-of-bounds read in PKCS7 parsing. A crafted PKCS7 message can trigger an OOB read on the heap. The missing bounds check is in the indefinite-length end-of-content verification loop in PKCS7_VerifySignedData().

Frequently asked questions

What is CVE-2026-5392?: Heap out-of-bounds read in PKCS7 parsing. A crafted PKCS7 message can trigger an OOB read on the heap. The missing bounds check is in the indefinite-length end-of-content verification loop in PKCS7_VerifySignedData().
How severe is CVE-2026-5392?: CVE-2026-5392 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.
Is CVE-2026-5392 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5392?: CVE-2026-5392 affects Wolfssl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5392?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5392 have an EU (EUVD) identifier?: Yes. CVE-2026-5392 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21229.
When was CVE-2026-5392 published?: CVE-2026-5392 was published on 2026-04-10 and last updated on 2026-06-17.

References

https://github.com/wolfssl/wolfssl/pull/10039

Affected products (1)

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

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