7.5

CVE-2026-44673

libyang: lyb_read_string() integer overflow → heap buffer overflow

libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential heap corruption. This vulnerability is fixed in SO 5.2.15.
Daten sind bereitgestellt durch das CVE Programm von Authorized Data Publishers (ADP) (Unstrukturiert)
HerstellerRed Hat
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Produkt Red Hat Enterprise Linux AppStream (v. 10)
Default Statusaffected
HerstellerRed Hat
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Produkt Red Hat Enterprise Linux AppStream (v. 8)
Default Statusaffected
HerstellerRed Hat
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Produkt Red Hat Enterprise Linux AppStream (v. 9)
Default Statusaffected
HerstellerRed Hat
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Produkt Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
Default Statusaffected
HerstellerRed Hat
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Produkt Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
Default Statusaffected
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.43% 0.343
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-190 Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh
https://access.redhat.com/errata/RHSA-2026:24545
https://access.redhat.com/errata/RHSA-2026:24758
https://access.redhat.com/errata/RHSA-2026:25051
https://access.redhat.com/security/cve/CVE-2026-44673
https://bugzilla.redhat.com/show_bug.cgi?id=2477617
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44673.json