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Vulnerability · Published Sep 30, 2026 · Assigned by redhat

CVE-2026-103242Rpm: heap-based buffer overflow write in hex2binv() via a mistyped rpmtag_filesignatures header tag

High 7.1

In plain English

A high-severity heap buffer overflow in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High
Exploit odds (30 days)0.1%top 98.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A heap-based buffer overflow flaw was found in rpm. RPMTAG_FILESIGNATURES in a crafted, unsigned RPM package's main header is declared with the wrong header type, causing hex2binv() to allocate a one-byte buffer and then write the tag's attacker-controlled, hex-decoded content — of attacker-chosen length — past the end of that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an untrusted package.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12rpmno fix listedDEBIAN-CVE-2026-103242
Debian:13rpmno fix listedDEBIAN-CVE-2026-103242
Debian:14rpmno fix listedDEBIAN-CVE-2026-103242
Ubuntu:22.04:LTSrpmno fix listedUBUNTU-CVE-2026-103242
Ubuntu:24.04:LTSrpmno fix listedUBUNTU-CVE-2026-103242
Ubuntu:26.04:LTSrpmno fix listedUBUNTU-CVE-2026-103242
Ubuntu:26.10rpmno fix listedUBUNTU-CVE-2026-103242

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Hardened Images see references

Weakness: CWE-122 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

References