01 Record
CVE-2026-5450
scanf %mc off-by-one heap buffer overflow
CriticalPUBLISHEDCNA: glibc
CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
02 Description
scanf %mc off-by-one 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 ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.50% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 42.6% of scored records. A rank, not a probability.
- NVD base score
- 9.8 (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:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-07-14.
- Red Hat severity
- Moderate. 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
- 2026-04-20 20:55Z6 MO AGO
- Last updated
- 2026-10-15 01:12Z14 DAYS AGO
- Reserved
- 2026-04-02
- Assigning CNA
- glibc
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.8)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- Data version
- 5.2
- Document digest
- c973895bce051d572673dedca118d4e46c769cdae19d159e255cdc067113e6cb
05 Affected products
VendorProductVersionsPlatforms
06 References
- sourceware.orghttps://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450
- inbox.sourceware.orghttps://inbox.sourceware.org/libc-announce/b11f0003-6ec1-4bd6-b9de-9e38a4efeca3@redhat.com/T/#u
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
07 Fixed in
AlmaLinux 8
- compat-libpthread-nonshared Fixed in 2.28-251.el8_10.38
- glibc Fixed in 2.28-251.el8_10.38
- glibc-all-langpacks Fixed in 2.28-251.el8_10.38
- glibc-benchtests Fixed in 2.28-251.el8_10.38
- glibc-common Fixed in 2.28-251.el8_10.38
- glibc-devel Fixed in 2.28-251.el8_10.38
- glibc-doc Fixed in 2.28-251.el8_10.38
- glibc-gconv-extra Fixed in 2.28-251.el8_10.38
- glibc-headers Fixed in 2.28-251.el8_10.38
- glibc-langpack-aa Fixed in 2.28-251.el8_10.38
- glibc-langpack-af Fixed in 2.28-251.el8_10.38
- glibc-langpack-agr Fixed in 2.28-251.el8_10.38
- glibc-langpack-ak Fixed in 2.28-251.el8_10.38
- glibc-langpack-am Fixed in 2.28-251.el8_10.38
- glibc-langpack-an Fixed in 2.28-251.el8_10.38
- glibc-langpack-anp Fixed in 2.28-251.el8_10.38
- glibc-langpack-ar Fixed in 2.28-251.el8_10.38
- glibc-langpack-as Fixed in 2.28-251.el8_10.38
- glibc-langpack-ast Fixed in 2.28-251.el8_10.38
- glibc-langpack-ayc Fixed in 2.28-251.el8_10.38
- glibc-langpack-az Fixed in 2.28-251.el8_10.38
- glibc-langpack-be Fixed in 2.28-251.el8_10.38
- glibc-langpack-bem Fixed in 2.28-251.el8_10.38
- glibc-langpack-ber Fixed in 2.28-251.el8_10.38
- glibc-langpack-bg Fixed in 2.28-251.el8_10.38
- glibc-langpack-bhb Fixed in 2.28-251.el8_10.38
- glibc-langpack-bho Fixed in 2.28-251.el8_10.38
- glibc-langpack-bi Fixed in 2.28-251.el8_10.38
- glibc-langpack-bn Fixed in 2.28-251.el8_10.38
- glibc-langpack-bo Fixed in 2.28-251.el8_10.38
- glibc-langpack-br Fixed in 2.28-251.el8_10.38
- glibc-langpack-brx Fixed in 2.28-251.el8_10.38
- glibc-langpack-bs Fixed in 2.28-251.el8_10.38
- glibc-langpack-byn Fixed in 2.28-251.el8_10.38
- glibc-langpack-ca Fixed in 2.28-251.el8_10.38
- glibc-langpack-ce Fixed in 2.28-251.el8_10.38
- glibc-langpack-chr Fixed in 2.28-251.el8_10.38
- glibc-langpack-cmn Fixed in 2.28-251.el8_10.38
- glibc-langpack-crh Fixed in 2.28-251.el8_10.38
- glibc-langpack-cs Fixed in 2.28-251.el8_10.38
174 further packages in AlmaLinux 8 not shown (first 40 listed).
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- glibc Fixed in 2.34-272.el9_8
- glibc-all-langpacks Fixed in 2.34-272.el9_8
- glibc-benchtests Fixed in 2.34-272.el9_8
- glibc-common Fixed in 2.34-272.el9_8
- glibc-devel Fixed in 2.34-272.el9_8
- glibc-doc Fixed in 2.34-272.el9_8
- glibc-gconv-extra Fixed in 2.34-272.el9_8
- glibc-headers Fixed in 2.34-272.el9_8
- glibc-langpack-aa Fixed in 2.34-272.el9_8
- glibc-langpack-af Fixed in 2.34-272.el9_8
- glibc-langpack-agr Fixed in 2.34-272.el9_8
- glibc-langpack-ak Fixed in 2.34-272.el9_8
- glibc-langpack-am Fixed in 2.34-272.el9_8
- glibc-langpack-an Fixed in 2.34-272.el9_8
- glibc-langpack-anp Fixed in 2.34-272.el9_8
- glibc-langpack-ar Fixed in 2.34-272.el9_8
- glibc-langpack-as Fixed in 2.34-272.el9_8
- glibc-langpack-ast Fixed in 2.34-272.el9_8
- glibc-langpack-ayc Fixed in 2.34-272.el9_8
- glibc-langpack-az Fixed in 2.34-272.el9_8
- glibc-langpack-be Fixed in 2.34-272.el9_8
- glibc-langpack-bem Fixed in 2.34-272.el9_8
- glibc-langpack-ber Fixed in 2.34-272.el9_8
- glibc-langpack-bg Fixed in 2.34-272.el9_8
- glibc-langpack-bhb Fixed in 2.34-272.el9_8
- glibc-langpack-bho Fixed in 2.34-272.el9_8
- glibc-langpack-bi Fixed in 2.34-272.el9_8
- glibc-langpack-bn Fixed in 2.34-272.el9_8
- glibc-langpack-bo Fixed in 2.34-272.el9_8
- glibc-langpack-br Fixed in 2.34-272.el9_8
- glibc-langpack-brx Fixed in 2.34-272.el9_8
- glibc-langpack-bs Fixed in 2.34-272.el9_8
- glibc-langpack-byn Fixed in 2.34-272.el9_8
- glibc-langpack-ca Fixed in 2.34-272.el9_8
- glibc-langpack-ce Fixed in 2.34-272.el9_8
- glibc-langpack-chr Fixed in 2.34-272.el9_8
- glibc-langpack-ckb Fixed in 2.34-272.el9_8
- glibc-langpack-cmn Fixed in 2.34-272.el9_8
- glibc-langpack-crh Fixed in 2.34-272.el9_8
- glibc-langpack-cs Fixed in 2.34-272.el9_8
175 further packages in AlmaLinux 9 not shown (first 40 listed).
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- glibc Fixed in 2.39-126.el10_2.alma.1
- glibc-all-langpacks Fixed in 2.39-126.el10_2.alma.1
- glibc-benchtests Fixed in 2.39-126.el10_2.alma.1
- glibc-common Fixed in 2.39-126.el10_2.alma.1
- glibc-devel Fixed in 2.39-126.el10_2.alma.1
- glibc-doc Fixed in 2.39-126.el10_2.alma.1
- glibc-gconv-extra Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-aa Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-af Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-agr Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ak Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-am Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-an Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-anp Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ar Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-as Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ast Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ayc Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-az Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-be Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bem Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ber Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bg Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bhb Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bho Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bi Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bn Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bo Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-br Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-brx Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bs Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-byn Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ca Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ce Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-chr Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ckb Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-cmn Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-crh Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-cs Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-csb Fixed in 2.39-126.el10_2.alma.1
181 further packages in AlmaLinux 10 not shown (first 40 listed).
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- compat-libpthread-nonshared Fixed in 2.28-251.el8_10.38
- glibc Fixed in 2.28-251.el8_10.38
- glibc-all-langpacks Fixed in 2.28-251.el8_10.38
- glibc-benchtests Fixed in 2.28-251.el8_10.38
- glibc-common Fixed in 2.28-251.el8_10.38
- glibc-devel Fixed in 2.28-251.el8_10.38
- glibc-doc Fixed in 2.28-251.el8_10.38
- glibc-gconv-extra Fixed in 2.28-251.el8_10.38
- glibc-headers Fixed in 2.28-251.el8_10.38
- glibc-langpack-aa Fixed in 2.28-251.el8_10.38
- glibc-langpack-af Fixed in 2.28-251.el8_10.38
- glibc-langpack-agr Fixed in 2.28-251.el8_10.38
- glibc-langpack-ak Fixed in 2.28-251.el8_10.38
- glibc-langpack-am Fixed in 2.28-251.el8_10.38
- glibc-langpack-an Fixed in 2.28-251.el8_10.38
- glibc-langpack-anp Fixed in 2.28-251.el8_10.38
- glibc-langpack-ar Fixed in 2.28-251.el8_10.38
- glibc-langpack-as Fixed in 2.28-251.el8_10.38
- glibc-langpack-ast Fixed in 2.28-251.el8_10.38
- glibc-langpack-ayc Fixed in 2.28-251.el8_10.38
- glibc-langpack-az Fixed in 2.28-251.el8_10.38
- glibc-langpack-be Fixed in 2.28-251.el8_10.38
- glibc-langpack-bem Fixed in 2.28-251.el8_10.38
- glibc-langpack-ber Fixed in 2.28-251.el8_10.38
- glibc-langpack-bg Fixed in 2.28-251.el8_10.38
- glibc-langpack-bhb Fixed in 2.28-251.el8_10.38
- glibc-langpack-bho Fixed in 2.28-251.el8_10.38
- glibc-langpack-bi Fixed in 2.28-251.el8_10.38
- glibc-langpack-bn Fixed in 2.28-251.el8_10.38
- glibc-langpack-bo Fixed in 2.28-251.el8_10.38
- glibc-langpack-br Fixed in 2.28-251.el8_10.38
- glibc-langpack-brx Fixed in 2.28-251.el8_10.38
- glibc-langpack-bs Fixed in 2.28-251.el8_10.38
- glibc-langpack-byn Fixed in 2.28-251.el8_10.38
- glibc-langpack-ca Fixed in 2.28-251.el8_10.38
- glibc-langpack-ce Fixed in 2.28-251.el8_10.38
- glibc-langpack-chr Fixed in 2.28-251.el8_10.38
- glibc-langpack-cmn Fixed in 2.28-251.el8_10.38
- glibc-langpack-crh Fixed in 2.28-251.el8_10.38
- glibc-langpack-cs Fixed in 2.28-251.el8_10.38
174 further packages in CloudLinux 8 not shown (first 40 listed).
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
- glibc Fixed in 2.34-272.el9_8
- glibc-all-langpacks Fixed in 2.34-272.el9_8
- glibc-benchtests Fixed in 2.34-272.el9_8
- glibc-common Fixed in 2.34-272.el9_8
- glibc-devel Fixed in 2.34-272.el9_8
- glibc-doc Fixed in 2.34-272.el9_8
- glibc-gconv-extra Fixed in 2.34-272.el9_8
- glibc-headers Fixed in 2.34-272.el9_8
- glibc-langpack-aa Fixed in 2.34-272.el9_8
- glibc-langpack-af Fixed in 2.34-272.el9_8
- glibc-langpack-agr Fixed in 2.34-272.el9_8
- glibc-langpack-ak Fixed in 2.34-272.el9_8
- glibc-langpack-am Fixed in 2.34-272.el9_8
- glibc-langpack-an Fixed in 2.34-272.el9_8
- glibc-langpack-anp Fixed in 2.34-272.el9_8
- glibc-langpack-ar Fixed in 2.34-272.el9_8
- glibc-langpack-as Fixed in 2.34-272.el9_8
- glibc-langpack-ast Fixed in 2.34-272.el9_8
- glibc-langpack-ayc Fixed in 2.34-272.el9_8
- glibc-langpack-az Fixed in 2.34-272.el9_8
- glibc-langpack-be Fixed in 2.34-272.el9_8
- glibc-langpack-bem Fixed in 2.34-272.el9_8
- glibc-langpack-ber Fixed in 2.34-272.el9_8
- glibc-langpack-bg Fixed in 2.34-272.el9_8
- glibc-langpack-bhb Fixed in 2.34-272.el9_8
- glibc-langpack-bho Fixed in 2.34-272.el9_8
- glibc-langpack-bi Fixed in 2.34-272.el9_8
- glibc-langpack-bn Fixed in 2.34-272.el9_8
- glibc-langpack-bo Fixed in 2.34-272.el9_8
- glibc-langpack-br Fixed in 2.34-272.el9_8
- glibc-langpack-brx Fixed in 2.34-272.el9_8
- glibc-langpack-bs Fixed in 2.34-272.el9_8
- glibc-langpack-byn Fixed in 2.34-272.el9_8
- glibc-langpack-ca Fixed in 2.34-272.el9_8
- glibc-langpack-ce Fixed in 2.34-272.el9_8
- glibc-langpack-chr Fixed in 2.34-272.el9_8
- glibc-langpack-ckb Fixed in 2.34-272.el9_8
- glibc-langpack-cmn Fixed in 2.34-272.el9_8
- glibc-langpack-crh Fixed in 2.34-272.el9_8
- glibc-langpack-cs Fixed in 2.34-272.el9_8
175 further packages in CloudLinux 9 not shown (first 40 listed).
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
- glibc Fixed in 2.39-126.el10_2.alma.1
- glibc-all-langpacks Fixed in 2.39-126.el10_2.alma.1
- glibc-benchtests Fixed in 2.39-126.el10_2.alma.1
- glibc-common Fixed in 2.39-126.el10_2.alma.1
- glibc-devel Fixed in 2.39-126.el10_2.alma.1
- glibc-doc Fixed in 2.39-126.el10_2.alma.1
- glibc-gconv-extra Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-aa Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-af Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-agr Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ak Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-am Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-an Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-anp Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ar Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-as Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ast Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ayc Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-az Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-be Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bem Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ber Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bg Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bhb Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bho Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bi Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bn Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bo Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-br Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-brx Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-bs Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-byn Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ca Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ce Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-chr Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-ckb Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-cmn Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-crh Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-cs Fixed in 2.39-126.el10_2.alma.1
- glibc-langpack-csb Fixed in 2.39-126.el10_2.alma.1
181 further packages in CloudLinux 10 not shown (first 40 listed).
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
- glibc No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- glibc Fixed in 2.41-12+deb13u4
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- glibc Fixed in 2.42-17
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- glibc Fixed in 2.35-0ubuntu3.14
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- glibc Fixed in 2.39-0ubuntu8.8
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- glibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- glibc Fixed in 2.43-2ubuntu2.3
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- eglibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- glibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- glibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- glibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. 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.