What’s Vulnerable › Vulnerabilities

CVE-2026-5435: Potential buffer overflow in ns_sprintrrf TSIG handling path

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-28 · updated 2026-07-14
• Weakness: CWE-787

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.

Affected products

• GNU C Library (glibc): from 2.2

References

• https://inbox.sourceware.org/libc-announce/7a655d55-276f-41fe-b550-feb3ebb2ce91@redhat.com/T/#u
• https://sourceware.org/bugzilla/show_bug.cgi?id=34033
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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