RHSA-2026:12740
Vulnerability from csaf_redhat - Published: 2026-05-01 14:05 - Updated: 2026-05-01 18:39A flaw was found in glibc, the GNU C Library. A remote attacker could exploit this vulnerability by providing specially crafted inputs using the IBM1390 or IBM1399 character sets to the `iconv()` function. This could lead to an assertion failure, causing the application to crash and resulting in a Denial of Service (DoS).
A flaw was found in glibc, the GNU C Library. Specifically, deprecated functions responsible for printing TSIG (Transaction Signature) records fail to properly manage memory buffers. This oversight can lead to an out-of-bounds write when processing specially crafted TSIG records. An attacker could exploit this to cause a denial of service or potentially execute arbitrary code.
A flaw was found in glibc (GNU C Library). This vulnerability occurs when an application uses the `scanf` family of functions with a `%mc` format specifier, which is used for dynamically allocating memory for character input, and provides an explicit width greater than 1024. This specific combination can lead to a one-byte heap buffer overflow, potentially allowing an attacker to corrupt memory.
A flaw was found in glibc (GNU C Library). When the `ungetwc` function is called on a file stream using wide characters with specific overlapping single-byte and multi-byte encodings, it may attempt to read data outside of its allocated buffer. This can lead to the unintentional disclosure of sensitive information from memory or cause the program to crash, resulting in a denial of service.
{
"document": {
"aggregate_severity": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"text": "Moderate"
},
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en",
"notes": [
{
"category": "summary",
"text": "An update for Red Hat Hardened Images RPMs is now available.",
"title": "Topic"
},
{
"category": "general",
"text": "This update includes the following RPMs:\n\nglibc:\n * compat-libpthread-nonshared-2.42-12.hum1 (aarch64, x86_64)\n * glibc-2.42-12.hum1 (aarch64, x86_64)\n * glibc-all-langpacks-2.42-12.hum1 (aarch64, x86_64)\n * glibc-benchtests-2.42-12.hum1 (aarch64, x86_64)\n * glibc-common-2.42-12.hum1 (aarch64, x86_64)\n * glibc-devel-2.42-12.hum1 (aarch64, x86_64)\n * glibc-doc-2.42-12.hum1 (noarch)\n * glibc-gconv-extra-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-aa-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-af-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-agr-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ak-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-am-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-an-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-anp-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ar-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-as-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ast-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ayc-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-az-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-be-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-bem-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ber-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-bg-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-bhb-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-bho-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-bi-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-bn-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-bo-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-br-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-brx-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-bs-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-byn-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ca-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ce-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-chr-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ckb-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-cmn-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-crh-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-cs-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-csb-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-cv-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-cy-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-da-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-de-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-doi-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-dsb-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-dv-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-dz-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-el-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-en-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-eo-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-es-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-et-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-eu-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-fa-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ff-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-fi-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-fil-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-fo-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-fr-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-fur-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-fy-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ga-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-gbm-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-gd-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-gez-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-gl-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-gu-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-gv-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ha-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-hak-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-he-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-hi-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-hif-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-hne-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-hr-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-hsb-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ht-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-hu-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-hy-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ia-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-id-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ig-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ik-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-is-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-it-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-iu-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ja-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ka-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-kab-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-kk-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-kl-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-km-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-kn-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ko-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-kok-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ks-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ku-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-kv-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-kw-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ky-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-lb-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-lg-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-li-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-lij-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ln-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-lo-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-lt-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ltg-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-lv-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-lzh-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mag-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mai-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mdf-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mfe-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mg-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mhr-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mi-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-miq-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mjw-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mk-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ml-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mn-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mni-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mnw-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mr-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ms-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-mt-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-my-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-nan-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-nb-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-nds-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ne-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-nhn-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-niu-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-nl-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-nn-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-nr-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-nso-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-oc-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-om-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-or-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-os-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-pa-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-pap-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-pl-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ps-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-pt-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-quz-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-raj-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-rif-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ro-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ru-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-rw-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sa-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sah-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sat-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sc-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-scn-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sd-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-se-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sgs-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-shn-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-shs-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-si-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sid-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sk-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sl-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sm-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-so-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sq-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sr-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ss-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ssy-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-st-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-su-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sv-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-sw-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-syr-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-szl-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ta-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-tcy-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-te-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-tg-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-th-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-the-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ti-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-tig-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-tk-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-tl-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-tn-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-to-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-tok-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-tpi-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-tr-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ts-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-tt-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ug-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-uk-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-unm-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ur-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-uz-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-ve-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-vi-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-wa-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-wae-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-wal-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-wo-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-xh-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-yi-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-yo-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-yue-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-yuw-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-zgh-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-zh-2.42-12.hum1 (aarch64, x86_64)\n * glibc-langpack-zu-2.42-12.hum1 (aarch64, x86_64)\n * glibc-locale-source-2.42-12.hum1 (aarch64, x86_64)\n * glibc-minimal-langpack-2.42-12.hum1 (aarch64, x86_64)\n * glibc-nss-devel-2.42-12.hum1 (aarch64, x86_64)\n * glibc-static-2.42-12.hum1 (aarch64, x86_64)\n * glibc-utils-2.42-12.hum1 (aarch64, x86_64)\n * glibc32-2.42-12.hum1 (x86_64)\n * libnsl-2.42-12.hum1 (aarch64, x86_64)\n * nss_db-2.42-12.hum1 (aarch64, x86_64)\n * nss_hesiod-2.42-12.hum1 (aarch64, x86_64)\n * sysroot-aarch64-fc43-glibc-2.42-12.hum1 (noarch)\n * sysroot-x86_64-fc43-glibc-2.42-12.hum1 (noarch)\n * glibc-2.42-12.hum1.src (src)",
"title": "Details"
},
{
"category": "legal_disclaimer",
"text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
"title": "Terms of Use"
}
],
"publisher": {
"category": "vendor",
"contact_details": "https://access.redhat.com/security/team/contact/",
"issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
"name": "Red Hat Product Security",
"namespace": "https://www.redhat.com"
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"references": [
{
"category": "self",
"summary": "https://access.redhat.com/errata/RHSA-2026:12740",
"url": "https://access.redhat.com/errata/RHSA-2026:12740"
},
{
"category": "external",
"summary": "https://images.redhat.com/",
"url": "https://images.redhat.com/"
},
{
"category": "external",
"summary": "https://access.redhat.com/security/cve/CVE-2026-5435",
"url": "https://access.redhat.com/security/cve/CVE-2026-5435"
},
{
"category": "external",
"summary": "https://access.redhat.com/security/updates/classification/",
"url": "https://access.redhat.com/security/updates/classification/"
},
{
"category": "external",
"summary": "https://access.redhat.com/security/cve/CVE-2026-5928",
"url": "https://access.redhat.com/security/cve/CVE-2026-5928"
},
{
"category": "external",
"summary": "https://access.redhat.com/security/cve/CVE-2026-5450",
"url": "https://access.redhat.com/security/cve/CVE-2026-5450"
},
{
"category": "external",
"summary": "https://access.redhat.com/security/cve/CVE-2026-4046",
"url": "https://access.redhat.com/security/cve/CVE-2026-4046"
},
{
"category": "self",
"summary": "Canonical URL",
"url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_12740.json"
}
],
"title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update",
"tracking": {
"current_release_date": "2026-05-01T18:39:02+00:00",
"generator": {
"date": "2026-05-01T18:39:02+00:00",
"engine": {
"name": "Red Hat SDEngine",
"version": "4.7.7"
}
},
"id": "RHSA-2026:12740",
"initial_release_date": "2026-05-01T14:05:33+00:00",
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"Red Hat Hardened Images:glibc-main@noarch",
"Red Hat Hardened Images:glibc-main@src",
"Red Hat Hardened Images:glibc-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "glibc: glibc: Information disclosure or denial of service via ungetwc function with specific wide character encodings"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.