How severe is CVE-2026-5772?

CVE-2026-5772 has a CVSS 3.x base score of 5.3, 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 none, and availability low.

Is CVE-2026-5772 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5772?

CVE-2026-5772 affects Wolfssl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5772?

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

Does CVE-2026-5772 have an EU (EUVD) identifier?

Yes. CVE-2026-5772 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21218.

When was CVE-2026-5772 published?

CVE-2026-5772 was published on 2026-04-09 and last updated on 2026-06-17.

CVE-2026-5772

CVE-2026-5772 is a medium-severity vulnerability in Wolfssl with a CVSS 3.x base score of 5.3. 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-126.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 2.1
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21218
Weakness: CWE-126
Affected product: Wolfssl
Published: 2026-04-09
Last modified: 2026-06-17

Description

A 1-byte stack buffer over-read was identified in the MatchDomainName function (src/internal.c) during wildcard hostname validation when the LEFT_MOST_WILDCARD_ONLY flag is active. If a wildcard * exhausts the entire hostname string, the function reads one byte past the buffer without a bounds check, which could cause a crash.

Frequently asked questions

What is CVE-2026-5772?: A 1-byte stack buffer over-read was identified in the MatchDomainName function (src/internal.c) during wildcard hostname validation when the LEFT_MOST_WILDCARD_ONLY flag is active. If a wildcard * exhausts the entire hostname string, the function reads one byte past the buffer without a bounds check, which could cause a crash.
How severe is CVE-2026-5772?: CVE-2026-5772 has a CVSS 3.x base score of 5.3, 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 none, and availability low.
Is CVE-2026-5772 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5772?: CVE-2026-5772 affects Wolfssl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5772?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5772 have an EU (EUVD) identifier?: Yes. CVE-2026-5772 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21218.
When was CVE-2026-5772 published?: CVE-2026-5772 was published on 2026-04-09 and last updated on 2026-06-17.

References

https://github.com/wolfSSL/wolfssl/pull/10119

Affected products (1)

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

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