Bug 2563090 - CVE-2026-115456 gcc: Out-of-bounds read in std::from_chars [fedora-all]
Summary: CVE-2026-115456 gcc: Out-of-bounds read in std::from_chars [fedora-all]
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: gcc
Version: rawhide
Hardware: Unspecified
OS: Unspecified
low
low
Target Milestone: ---
Assignee: Jakub Jelinek
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["545bcf7b-5733-4a50-a1bd-1...
Depends On:
Blocks: CVE-2026-115456
TreeView+ depends on / blocked
 
Reported: 2026-10-28 18:45 UTC by Marco Benatto
Modified: 2026-11-01 03:36 UTC (History)
12 users (show)

Fixed In Version: gcc-16.2.1-3.fc45 gcc-16.2.1-3.fc44
Clone Of:
Environment:
Last Closed: 2026-10-31 18:53:58 UTC
Type: ---
Embargoed:

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System ID Private Priority Status Summary Last Updated
GNU Compiler Collection 127666 0 P3 RESOLVED std::from_chars(first, last, long double&) reads past 'last' for "inf"/"nan" (strlen on the unterminated input) 2026-10-28 19:20:34 UTC

Description Marco Benatto 2026-10-28 18:45:24 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

There's a out-of-bounds read in std::from_chars() in libstdc++ when the string being passed as parameter is not NULL terminated. The impact is limited to read invalid float point numbers or reach a non-readable memory position resulting a a Denial-of-Service only.
Comment 1 Fedora Update System 2026-10-30 23:25:56 UTC 
FEDORA-2026-589138efb1 (gcc-16.2.1-3.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-589138efb1
Comment 2 Fedora Update System 2026-10-30 23:28:22 UTC 
FEDORA-2026-d732fb97a0 (gcc-16.2.1-3.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-d732fb97a0
Comment 3 Fedora Update System 2026-10-31 03:04:17 UTC 
FEDORA-2026-d732fb97a0 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-d732fb97a0`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-d732fb97a0

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 4 Fedora Update System 2026-10-31 05:14:40 UTC 
FEDORA-2026-589138efb1 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-589138efb1`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-589138efb1

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 5 Fedora Update System 2026-10-31 18:53:58 UTC 
FEDORA-2026-589138efb1 (gcc-16.2.1-3.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.
Comment 6 Fedora Update System 2026-11-01 03:36:33 UTC 
FEDORA-2026-d732fb97a0 (gcc-16.2.1-3.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.
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