CVE-2026-44673
libyang: lyb_read_string() integer overflow → heap buffer overflow
02 Description
libyang: lyb_read_string() integer overflow → heap buffer overflow
03 Exploitation and scoring
- Exploitation
- Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
- SSVC decision
- ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.63% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 50.1% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Deferred. NVD last modified this record on 2026-10-26.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-05-14 20:35Z5 MO AGO
- Last updated
- 2026-09-09 12:05Z1 MO AGO
- Reserved
- 2026-05-07
- Assigning CNA
- GitHub_M
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-190Integer Overflow or WraparoundBase
- Data version
- 5.2
- Document digest
- 797edaaa0e69aea4a2e6477430676a5f27658fb58c985f7bb79b6ab949426a14
05 Affected products
06 References
- github.comhttps://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-44673
- bugzilla.redhat.comRHBZ#2477617https://bugzilla.redhat.com/show_bug.cgi?id=2477617
- security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44673.json
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:49666
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:24758
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:24545
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:51351
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:51368
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:51339
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:65477
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:65467
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:65508
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:25051
07 Fixed in
AlmaLinux 8
- libyang Fixed in 1.0.184-2.el8_10
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- libyang Fixed in 2.1.148-1.el9_8.1
- libyang-devel Fixed in 2.1.148-1.el9_8.1
- libyang-devel-doc Fixed in 2.1.148-1.el9_8.1
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- libyang Fixed in 2.1.148-4.el10_2
- libyang-devel Fixed in 2.1.148-4.el10_2
- libyang-devel-doc Fixed in 2.1.148-4.el10_2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- libyang Fixed in 1.0.184-2.el8_10
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- libyang Fixed in 2.1.148-1.el9_8.1
- libyang-devel Fixed in 2.1.148-1.el9_8.1
- libyang-devel-doc Fixed in 2.1.148-1.el9_8.1
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- libyang Fixed in 2.1.148-4.el10_2
- libyang-devel Fixed in 2.1.148-4.el10_2
- libyang-devel-doc Fixed in 2.1.148-4.el10_2
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- libyang2 No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- libyang No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- libyang Fixed in 6.4.13-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.