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Fencer Vulns
medium 6.8

CVE-2007-1659 json

Perl-Compatible Regular Expression (PCRE) library before 7.3 allows context-dependent attackers to cause a denial of service (crash) and po…

published 2007-11-07 19 y ago modified 2026-06-16 4 mo ago also EUVD-2007-1653

cvss
6.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.5%
EPSS 3.5% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

Perl-Compatible Regular Expression (PCRE) library before 7.3 allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via regex patterns containing unmatched "\Q\E" sequences with orphan "\E" codes.

Patch / fix

  • pcre3 Debian 12 7.3-1
  • glib2.0 Debian 14, Debian 13, Debian 12 2.14.3-1

debian advisories DEBIAN-CVE-2007-1659

  • pcre RHEL 4 4.5-4.el4_6.6
  • pcre RHEL 5 6.6-2.el5_0.1

red hat advisories RHSA-2007:1068RHSA-2007:0967

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-2007-1659 updated

pcre regular expression flaws

  • Red Hat Enterprise Linux (v. 5 server) pcre 6.6-2.el5_0.1
    fixed: vendor fix RHSA-2007:0967
  • Red Hat Enterprise Linux AS version 4 pcre 4.5-4.el4_6.6
    fixed: vendor fix RHSA-2007:1068
  • Red Hat Enterprise Linux Desktop (v. 5 client) pcre 6.6-2.el5_0.1
    fixed: vendor fix RHSA-2007:0967
  • Red Hat Enterprise Linux Desktop version 4 pcre 4.5-4.el4_6.6
    fixed: vendor fix RHSA-2007:1068
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) pcre 6.6-2.el5_0.1
    fixed: vendor fix RHSA-2007:0967
  • Red Hat Enterprise Linux ES version 4 pcre 4.5-4.el4_6.6 Red Hat Enterprise Linux WS version 4 pcre 4.5-4.el4_6.6
    fixed: vendor fix RHSA-2007:1068

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

3.53% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns 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.