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Fencer Intel
high 7.5

CVE-2015-8853 json

The (1) S_reghop3, (2) S_reghop4, and (3) S_reghopmaybe3 functions in regexec.c in Perl before 5.24.0 allow context-dependent attackers to…

published 10y ago modified 4mo ago also EUVD-2015-8718

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

The (1) S_reghop3, (2) S_reghop4, and (3) S_reghopmaybe3 functions in regexec.c in Perl before 5.24.0 allow context-dependent attackers to cause a denial of service (infinite loop) via crafted utf-8 data, as demonstrated by "a\x80."

Patch / fix

  • perl Debian 14, Debian 13, Debian 12 5.22.1-1

debian advisories DEBIAN-CVE-2015-8853

  • perl Ubuntu 14.04 LTS 5.18.2-2ubuntu1.4

ubuntu advisories UBUNTU-CVE-2015-8853

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • perl hummingbird 1 5.42.2-524.hum1
  • perl-B hummingbird 1 1.89-524.hum1
  • perl-if hummingbird 1 0.61.000-524.hum1
  • perl-IO hummingbird 1 1.55-524.hum1
  • perl-ph hummingbird 1 5.42.2-524.hum1
  • perl-lib hummingbird 1 0.65-524.hum1
  • perl-mro hummingbird 1 1.29-524.hum1
  • perl-Net hummingbird 1 1.04-524.hum1

red hat advisories RHSA-2026:6206

  • perl SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 5.18.2-11.1
  • perl SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 5.10.0-64.80.1

suse advisories SUSE-SU-2016:2263-1SUSE-SU-2016:2246-1

Is CVE-2015-8853 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-8853 updated cvss 5.4

perl: regexp matching hangs indefinitely on illegal UTF-8 input

  • Red Hat Directory Server 8 perl Red Hat Enterprise Linux 5 perl Red Hat Enterprise Linux 6 perl, perl-CGI, perl-core, perl-CPAN, perl-libs, perl-parent, +39 more Red Hat Enterprise Linux 7 perl, perl-core, perl-CPAN, perl-libs, perl-tests, perl-macros, +11 more Red Hat Software Collections perl516-perl, rh-perl520-perl, perl516-perl-Env, perl516-perl-core, perl516-perl-CPAN, perl516-perl-libs, +50 more
    affected: no fix planned “Will not fix”
  • Red Hat Hardened Images perl 5.42.2-524.hum1, perl-B 1.89-524.hum1, perl-IO 1.55-524.hum1, perl-Tie 4.6-524.hum1, perl-lib 0.65-524.hum1, perl-mro 1.29-524.hum1, +93 more
    fixed: vendor fix RHSA-2026:6206

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.55% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.