Vulnerability · Published Apr 28, 2026 · Assigned by glibc

CVE-2026-6238Buffer overread in ns_printrrf with corrupted RDATA field

Medium 6.5

In plain English

A medium-severity security flaw in glibc from The GNU C Library. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 70.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, TKEY or TSIG records, which may allow an attacker to craft a DNS response, causing a target application to crash or read uninitialized memory. These functions are for application debugging only and hence not in the path of code executed by the DNS resolver. Further, they have been deprecated since version 2.34 and should not be used by any new applications. Applications should consider porting away from these interfaces since they may be removed in future versions.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8compat-libpthread-nonshared2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:10glibc2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-all-langpacks2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-all-langpacks2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-all-langpacks2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-benchtests2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-benchtests2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-benchtests2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-common2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-common2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-common2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-devel2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-devel2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-devel2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-doc2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-doc2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-doc2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-gconv-extra2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-gconv-extra2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-gconv-extra2.34-274.el9_8ALSA-2026:42952
AlmaLinux:8glibc-headers2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-headers2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-aa2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-aa2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-aa2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-af2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-af2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-af2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-agr2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-agr2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-agr2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-ak2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-ak2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-ak2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-am2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-am2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-am2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-an2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-an2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-an2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-anp2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-anp2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-anp2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-ar2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-ar2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-ar2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-as2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-as2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-as2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-ast2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-ast2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-ast2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-ayc2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-ayc2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-ayc2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-az2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-az2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-az2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-be2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-be2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-be2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-bem2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-bem2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-bem2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-ber2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-ber2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-ber2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-bg2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-bg2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-bg2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-bhb2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-bhb2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-bhb2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-bho2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-bho2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-bho2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-bi2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-bi2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-bi2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-bn2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-bn2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-bn2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-bo2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-bo2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-bo2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-br2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-br2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-br2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-brx2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-brx2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-brx2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-bs2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-bs2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-bs2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-byn2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-byn2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-byn2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-ca2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-ca2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-ca2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-ce2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-ce2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-ce2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-chr2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-chr2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-chr2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-ckb2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:9glibc-langpack-ckb2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-cmn2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-cmn2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-cmn2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-crh2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-crh2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-crh2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-cs2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-cs2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-cs2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-csb2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-csb2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-csb2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-cv2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-cv2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-cv2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-cy2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-cy2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-cy2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-da2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-da2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-da2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-de2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-de2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-de2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-doi2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-doi2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-doi2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-dsb2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-dsb2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-dsb2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-dv2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-dv2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-dv2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-dz2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-dz2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-dz2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-el2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-el2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-el2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-en2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-en2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-en2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-eo2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-eo2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-eo2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-es2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-es2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-es2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-et2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-et2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-et2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-eu2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-eu2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-eu2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-fa2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-fa2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-fa2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-ff2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-ff2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-ff2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-fi2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-fi2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-fi2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-fil2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-fil2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-fil2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-fo2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-fo2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-fo2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-fr2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-fr2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-fr2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-fur2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-fur2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-fur2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-fy2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-fy2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-fy2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-ga2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-ga2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-ga2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-gbm2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:10glibc-langpack-gd2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-gd2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-gd2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-gez2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-gez2.28-251.el8_10.40ALSA-2026:42733
AlmaLinux:9glibc-langpack-gez2.34-274.el9_8ALSA-2026:42952
AlmaLinux:10glibc-langpack-gl2.39-128.el10_2.alma.1ALSA-2026:42694
AlmaLinux:8glibc-langpack-gl2.28-251.el8_10.40ALSA-2026:42733

Affected products (as reported)

VendorProductVersions
The GNU C Library glibc 2.0.1 – through 2.43

Weakness: CWE-126 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

References