How severe is CVE-2026-5435?

CVE-2026-5435 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-5435 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5435?

CVE-2026-5435 affects Gnu Glibc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5435?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-5435 have an EU (EUVD) identifier?

Yes. CVE-2026-5435 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26036.

When was CVE-2026-5435 published?

CVE-2026-5435 was published on 2026-04-28 and last updated on 2026-06-17.

CVE-2026-5435

CVE-2026-5435 is a high-severity vulnerability in Gnu Glibc with a CVSS 3.x base score of 7.3. 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.3)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26036
Weakness: CWE-787
Affected product: Gnu Glibc
Published: 2026-04-28
Last modified: 2026-06-17

Description

The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail to enforce the caller-supplied buffer length, and can result in an out-of-bounds write when printing TSIG records.

Frequently asked questions

What is CVE-2026-5435?: The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail to enforce the caller-supplied buffer length, and can result in an out-of-bounds write when printing TSIG records.
How severe is CVE-2026-5435?: CVE-2026-5435 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-5435 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5435?: CVE-2026-5435 affects Gnu Glibc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5435?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-5435 have an EU (EUVD) identifier?: Yes. CVE-2026-5435 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26036.
When was CVE-2026-5435 published?: CVE-2026-5435 was published on 2026-04-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*

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