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

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.

Published: 2026-04-28 Last update: 2026-05-05 Assigner: 3ff69d7a-14f2-4f67-a097-88dee7810d18 Source: 3ff69d7a-14f2-4f67-a097-88dee7810d18
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-5435 is rated Low Risk (33/100): CVSS High severity, with low exploitation likelihood (EPSS 0.04%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-5435

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-29 — 0.04% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-5435

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.3 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 3.4 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-5435

GitHub Security Advisory for CVE-2026-5435

GHSA-32rw-r8mp-pw42 · Severity: high — The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2...

OS Trackers for CVE-2026-5435

vendor priority summary link
debian not yet assigned CVE-2026-5435 not yet assigned priority: Debian including 1 source packages (glibc), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5. https://security-tracker.debian.org/tracker/CVE-2026-5435
redhat medium — https://access.redhat.com/security/cve/CVE-2026-5435
suse medium CVE-2026-5435 severity moderate: SUSE including 15 source package names (cross-aarch64-linux-glibc-devel, cross-arm-linux-glibc-devel, …), 45 product×package rows across 29 product lines (SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS, SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS, … (29 product lines)): Known Not Affected 45. https://www.suse.com/security/cve/CVE-2026-5435/
ubuntu medium CVE-2026-5435 medium priority: Ubuntu including 2 source packages (eglibc, glibc), 14 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): needs-triage 10, DNE 4. https://ubuntu.com/security/CVE-2026-5435

Affected software / configurations for CVE-2026-5435

Vendor Product Version Raw CPE
gnu glibc >= 2.2 cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*

References for CVE-2026-5435

cvelogic Threat Intelligence