How severe is CVE-2026-5448?

CVE-2026-5448 has a CVSS 3.x base score of 4.3, 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 none, integrity none, and availability low.

Is CVE-2026-5448 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5448?

CVE-2026-5448 affects Wolfssl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5448?

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

Does CVE-2026-5448 have an EU (EUVD) identifier?

Yes. CVE-2026-5448 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21233.

When was CVE-2026-5448 published?

CVE-2026-5448 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-5448

CVE-2026-5448 is a medium-severity vulnerability in Wolfssl with a CVSS 3.x base score of 4.3. 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-122.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v4: 2.3
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21233
Weakness: CWE-122
Affected product: Wolfssl
Published: 2026-04-10
Last modified: 2026-06-17

Description

X.509 date buffer overflow in wolfSSL_X509_notAfter / wolfSSL_X509_notBefore. A buffer overflow may occur when parsing date fields from a crafted X.509 certificate via the compatibility layer API. This is only triggered when calling these two APIs directly from an application, and does not affect TLS or certificate verify operations in wolfSSL.

Frequently asked questions

What is CVE-2026-5448?: X.509 date buffer overflow in wolfSSL_X509_notAfter / wolfSSL_X509_notBefore. A buffer overflow may occur when parsing date fields from a crafted X.509 certificate via the compatibility layer API. This is only triggered when calling these two APIs directly from an application, and does not affect TLS or certificate verify operations in wolfSSL.
How severe is CVE-2026-5448?: CVE-2026-5448 has a CVSS 3.x base score of 4.3, 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 none, integrity none, and availability low.
Is CVE-2026-5448 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5448?: CVE-2026-5448 affects Wolfssl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5448?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5448 have an EU (EUVD) identifier?: Yes. CVE-2026-5448 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21233.
When was CVE-2026-5448 published?: CVE-2026-5448 was published on 2026-04-10 and last updated on 2026-06-17.

References

https://github.com/wolfSSL/wolfssl/pull/10071

Affected products (1)

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

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