UBUNTU-CVE-2026-15534
- Source
- https://ubuntu.com/security/CVE-2026-15534
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15534.json
- JSON Data
- https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-15534
- Upstream
- Published
- 2026-08-09T18:16:00Z
- Modified
- 2026-08-13T03:00:14.476883900Z
- Severity
-
- Ubuntu - medium
- Summary
- [none]
- Details
-
Perl versions through 5.45.1 have out-of-bounds heap reads and writes during regular expression matching via an undersized superlinear cache in S_regmatch. The regex engine's superlinear cache holds one bit per subject position for each participating WHILEM node, so the bit count is the subject length plus one times the number of nodes. Nothing checks that product for positive overflow of the signed 32-bit count: a 286331153 byte subject matched against a pattern with 15 participating nodes stores the count as 14, leaving a two byte cache. The cache is then indexed from the real match position and node number, so reads go past the end of the allocation, and on failure CACHEsayNO sets a bit past it. A caller that matches an attacker controlled subject of this size against a pattern of this shape can crash the process or corrupt heap memory.
- References
-
- https://ubuntu.com/security/CVE-2026-15534
- https://www.cve.org/CVERecord?id=CVE-2026-15534
- https://github.com/Perl/perl5/commit/54cf3d44cbbedd17d774e9a37921963e8fd5d0cb.patch
- https://github.com/Perl/perl5/commit/568e6fd238867bb9e99fa3f47cba3169009239e0.patch
- http://www.openwall.com/lists/oss-security/2026/08/09/12
- http://www.openwall.com/lists/oss-security/2026/08/09/13
Affected packages
Ubuntu:22.04:LTS
perl
Package
- Name
- perl
- Purl
- pkg:deb/ubuntu/perl?arch=source&distro=jammy
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
5.*
5.32.1-3ubuntu3
5.34.0-3ubuntu1
5.34.0-3ubuntu1.1
5.34.0-3ubuntu1.2
5.34.0-3ubuntu1.3
5.34.0-3ubuntu1.4
5.34.0-3ubuntu1.5
5.34.0-3ubuntu1.7
Ecosystem specific
{
"binaries": [
{
"binary_version": "5.34.0-3ubuntu1.7",
"binary_name": "libperl5.34"
},
{
"binary_version": "5.34.0-3ubuntu1.7",
"binary_name": "perl"
},
{
"binary_version": "5.34.0-3ubuntu1.7",
"binary_name": "perl-base"
},
{
"binary_version": "5.34.0-3ubuntu1.7",
"binary_name": "perl-debug"
},
{
"binary_version": "5.34.0-3ubuntu1.7",
"binary_name": "perl-modules-5.34"
}
]
}Ubuntu:24.04:LTS
perl
Package
- Name
- perl
- Purl
- pkg:deb/ubuntu/perl?arch=source&distro=noble
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
5.*
5.36.0-9ubuntu1
5.36.0-10ubuntu1
5.38.2-3
5.38.2-3.2
5.38.2-3.2build1
5.38.2-3.2build2
5.38.2-3.2build2.1
5.38.2-3.2ubuntu0.1
5.38.2-3.2ubuntu0.2
5.38.2-3.2ubuntu0.3
Ecosystem specific
{
"binaries": [
{
"binary_version": "5.38.2-3.2ubuntu0.3",
"binary_name": "libperl5.38t64"
},
{
"binary_version": "5.38.2-3.2ubuntu0.3",
"binary_name": "perl"
},
{
"binary_version": "5.38.2-3.2ubuntu0.3",
"binary_name": "perl-base"
},
{
"binary_version": "5.38.2-3.2ubuntu0.3",
"binary_name": "perl-debug"
},
{
"binary_version": "5.38.2-3.2ubuntu0.3",
"binary_name": "perl-modules-5.38"
}
]
}Ubuntu:26.04:LTS
perl
Package
- Name
- perl
- Purl
- pkg:deb/ubuntu/perl?arch=source&distro=resolute
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Ecosystem specific
{
"binaries": [
{
"binary_version": "5.40.1-7ubuntu0.1",
"binary_name": "libperl5.40"
},
{
"binary_version": "5.40.1-7ubuntu0.1",
"binary_name": "perl"
},
{
"binary_version": "5.40.1-7ubuntu0.1",
"binary_name": "perl-base"
},
{
"binary_version": "5.40.1-7ubuntu0.1",
"binary_name": "perl-debug"
},
{
"binary_version": "5.40.1-7ubuntu0.1",
"binary_name": "perl-modules-5.40"
}
]
}Ubuntu:Pro:14.04:LTS
perl
Package
- Name
- perl
- Purl
- pkg:deb/ubuntu/perl?arch=source&distro=esm-infra-legacy%2Ftrusty
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
5.*
5.14.2-21build1
5.18.1-4
5.18.1-4build1
5.18.1-5
5.18.2-2
5.18.2-2ubuntu1
5.18.2-2ubuntu1.1
5.18.2-2ubuntu1.3
5.18.2-2ubuntu1.4
5.18.2-2ubuntu1.6
5.18.2-2ubuntu1.7
5.18.2-2ubuntu1.7+esm3
5.18.2-2ubuntu1.7+esm4
5.18.2-2ubuntu1.7+esm5
5.18.2-2ubuntu1.7+esm7
Ecosystem specific
{
"binaries": [
{
"binary_version": "5.18.2-2ubuntu1.7+esm7",
"binary_name": "libcgi-fast-perl"
},
{
"binary_version": "5.18.2-2ubuntu1.7+esm7",
"binary_name": "libperl5.18"
},
{
"binary_version": "5.18.2-2ubuntu1.7+esm7",
"binary_name": "perl"
},
{
"binary_version": "5.18.2-2ubuntu1.7+esm7",
"binary_name": "perl-base"
},
{
"binary_version": "5.18.2-2ubuntu1.7+esm7",
"binary_name": "perl-debug"
},
{
"binary_version": "5.18.2-2ubuntu1.7+esm7",
"binary_name": "perl-modules"
}
]
}Ubuntu:Pro:16.04:LTS
perl
Package
- Name
- perl
- Purl
- pkg:deb/ubuntu/perl?arch=source&distro=esm-infra-legacy%2Fxenial
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
5.*
5.20.2-6
5.22.1-3
5.22.1-4
5.22.1-5
5.22.1-7
5.22.1-8
5.22.1-9
5.22.1-9ubuntu0.2
5.22.1-9ubuntu0.3
5.22.1-9ubuntu0.5
5.22.1-9ubuntu0.6
5.22.1-9ubuntu0.9
5.22.1-9ubuntu0.9+esm1
5.22.1-9ubuntu0.9+esm2
Ecosystem specific
{
"binaries": [
{
"binary_version": "5.22.1-9ubuntu0.9+esm2",
"binary_name": "libperl5.22"
},
{
"binary_version": "5.22.1-9ubuntu0.9+esm2",
"binary_name": "perl"
},
{
"binary_version": "5.22.1-9ubuntu0.9+esm2",
"binary_name": "perl-base"
},
{
"binary_version": "5.22.1-9ubuntu0.9+esm2",
"binary_name": "perl-debug"
},
{
"binary_version": "5.22.1-9ubuntu0.9+esm2",
"binary_name": "perl-modules-5.22"
}
]
}Ubuntu:Pro:18.04:LTS
perl
Package
- Name
- perl
- Purl
- pkg:deb/ubuntu/perl?arch=source&distro=esm-infra%2Fbionic
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
5.*
5.26.0-8ubuntu1
5.26.1-2ubuntu1
5.26.1-3
5.26.1-4
5.26.1-4build1
5.26.1-5
5.26.1-6
5.26.1-6ubuntu0.1
5.26.1-6ubuntu0.2
5.26.1-6ubuntu0.3
5.26.1-6ubuntu0.5
5.26.1-6ubuntu0.6
5.26.1-6ubuntu0.7
5.26.1-6ubuntu0.7+esm2
Ecosystem specific
{
"binaries": [
{
"binary_version": "5.26.1-6ubuntu0.7+esm2",
"binary_name": "libperl5.26"
},
{
"binary_version": "5.26.1-6ubuntu0.7+esm2",
"binary_name": "perl"
},
{
"binary_version": "5.26.1-6ubuntu0.7+esm2",
"binary_name": "perl-base"
},
{
"binary_version": "5.26.1-6ubuntu0.7+esm2",
"binary_name": "perl-debug"
},
{
"binary_version": "5.26.1-6ubuntu0.7+esm2",
"binary_name": "perl-modules-5.26"
}
]
}Ubuntu:Pro:20.04:LTS
perl
Package
- Name
- perl
- Purl
- pkg:deb/ubuntu/perl?arch=source&distro=esm-infra%2Ffocal
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
5.*
5.28.1-6build1
5.30.0-7
5.30.0-9
5.30.0-9build1
5.30.0-9ubuntu0.2
5.30.0-9ubuntu0.3
5.30.0-9ubuntu0.4
5.30.0-9ubuntu0.5
5.30.0-9ubuntu0.5+esm2
Ecosystem specific
{
"binaries": [
{
"binary_version": "5.30.0-9ubuntu0.5+esm2",
"binary_name": "libperl5.30"
},
{
"binary_version": "5.30.0-9ubuntu0.5+esm2",
"binary_name": "perl"
},
{
"binary_version": "5.30.0-9ubuntu0.5+esm2",
"binary_name": "perl-base"
},
{
"binary_version": "5.30.0-9ubuntu0.5+esm2",
"binary_name": "perl-debug"
},
{
"binary_version": "5.30.0-9ubuntu0.5+esm2",
"binary_name": "perl-modules-5.30"
}
]
}