CVE-2026-15534

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Source
https://cve.org/CVERecord?id=CVE-2026-15534
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-15534.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-15534
Downstream
Published
2026-08-09T17:49:50.033Z
Modified
2026-08-13T04:02:22.518899758Z
Severity
  • 5.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
Summary
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
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.

Database specific 
{
    "cwe_ids": [
        "CWE-125",
        "CWE-190",
        "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15534.json",
    "cna_assigner": "CPANSec"
}
References

Affected packages

Git / github.com/perl/perl5

Affected ranges

Type
GIT
Repo
https://github.com/perl/perl5
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
9203e64d14dfad6452ac45fa911f698a331c154b
Fixed
54cf3d44cbbedd17d774e9a37921963e8fd5d0cb
Fixed
568e6fd238867bb9e99fa3f47cba3169009239e0
Database specific
Show details 
{
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "5.45.1"
        }
    ]
}

Affected versions

Other
GitLive-blead
perl-5a2
perl-5a9
if-0.*
if-0.0603
if-0.0604
if-0.0605
perl-1.*
perl-1.0
perl-2.*
perl-2.0
perl-3.*
perl-3.000
perl-3.044
perl-4.*
perl-4.0.00
perl-4.0.36
perl-5.*
perl-5.000
perl-5.000o
perl-5.001
perl-5.001n
perl-5.002
perl-5.002_01
perl-5.003
perl-5.005
perl-5.6.0
perl-5.7.0
perl-5.7.1
perl-5.7.2
perl-5.7.3
perl-5.8.0
perl-5.9.0
perl-5.9.1
perl-5.9.2
perl-5.9.3
perl-5.9.4
perl-5.9.5
v5.*
v5.10.0
v5.11.0
v5.11.1
v5.11.3
v5.11.4
v5.11.5
v5.12.0
v5.12.0-RC0
v5.12.0-RC1
v5.12.0-RC2
v5.12.0-RC3
v5.12.0-RC4
v5.12.0-RC5
v5.13.0
v5.13.1
v5.13.10
v5.13.11
v5.13.2
v5.13.3
v5.13.4
v5.13.5
v5.13.6
v5.13.7
v5.13.8
v5.13.9
v5.14.0
v5.14.0-RC1
v5.14.0-RC2
v5.14.0-RC3
v5.15.0
v5.15.1
v5.15.2
v5.15.3
v5.15.4
v5.15.5
v5.15.9
v5.16.0
v5.16.0-RC1
v5.16.0-RC2
v5.17.0
v5.17.2
v5.17.4
v5.17.6
v5.17.7
v5.17.7.0
v5.17.8
v5.17.9
v5.18.0
v5.18.0-RC1
v5.18.0-RC2
v5.18.0-RC3
v5.18.0-RC4
v5.19.0
v5.19.1
v5.19.11
v5.19.2
v5.19.3
v5.19.5
v5.19.7
v5.20.0
v5.20.0-RC1
v5.21.0
v5.21.1
v5.21.10
v5.21.11
v5.21.4
v5.21.5
v5.21.6
v5.21.8
v5.21.9
v5.22.0
v5.22.0-RC1
v5.22.0-RC2
v5.23.0
v5.23.1
v5.23.2
v5.23.3
v5.23.4
v5.23.6
v5.23.7
v5.24.0
v5.24.0-RC1
v5.24.0-RC2
v5.24.0-RC3
v5.24.0-RC4
v5.24.0-RC5
v5.25.0
v5.25.11
v5.25.2
v5.25.3
v5.25.4
v5.25.5
v5.25.7
v5.25.9
v5.26.0
v5.26.0-RC2
v5.27.0
v5.27.10
v5.27.11
v5.27.3
v5.27.5
v5.27.6
v5.27.7
v5.27.8
v5.28.0
v5.28.0-RC1
v5.28.0-RC2
v5.28.0-RC3
v5.28.0-RC4
v5.29.0
v5.29.1
v5.29.10
v5.29.5
v5.29.6
v5.29.7
v5.29.8
v5.29.9
v5.30.0
v5.30.0-RC1
v5.30.0-RC2
v5.31.0
v5.31.1
v5.31.11
v5.31.2
v5.31.3
v5.31.4
v5.31.5
v5.31.7
v5.32.0
v5.32.0-RC1
v5.33.0
v5.33.1
v5.33.2
v5.33.3
v5.33.4
v5.33.7
v5.33.8
v5.33.9
v5.34.0
v5.34.0-RC1
v5.34.0-RC2
v5.35.0
v5.35.10
v5.35.11
v5.35.3
v5.35.5
v5.35.6
v5.35.8
v5.35.9
v5.36.0
v5.36.0-RC3
v5.37.0
v5.37.1
v5.37.10
v5.37.11
v5.37.2
v5.37.3
v5.37.4
v5.37.5
v5.37.6
v5.37.7
v5.37.9
v5.38.0
v5.38.0-RC1
v5.38.0-RC2
v5.39.0
v5.39.1
v5.39.3
v5.39.4
v5.39.5
v5.39.7
v5.39.8
v5.40.0
v5.40.0-RC1
v5.40.0-RC2
v5.41.0
v5.41.1
v5.41.10
v5.41.11
v5.41.12
v5.41.13
v5.41.2
v5.41.3
v5.41.4
v5.41.5
v5.41.7
v5.41.8
v5.41.9
v5.42.0
v5.42.0-RC1
v5.42.0-RC2
v5.42.0-RC3
v5.43.0
v5.43.1
v5.43.10
v5.43.11
v5.43.2
v5.43.6
v5.43.8
v5.43.9
v5.44.0
v5.44.0-RC1
v5.44.0-RC2
v5.45.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-15534.json"