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7.6

OpenEuler PCRE2 can write beyond memory with crafted pattern

published 19 days ago
Summary

The PCRE2 library used in OpenEuler versions before 10.49 can write data outside its allocated memory when a specially crafted regular expression is processed with certain JIT functions. This could allow an attacker to modify program data or take control of the system. Update PCRE2 to version 10.49 or later to fix the problem.

What to do
  • Update openeuler pcre2 to version 10.39-25.oe2203sp4.
Affected software
Ecosystem VendorProductAffected versions
openEuler:22.03-LTS-SP4 openeuler pcre2 < 10.39-25.oe2203sp4
Fix: upgrade to 10.39-25.oe2203sp4
Original advisory text
pcre2 security update
PCRE2 is a re-working of the original PCRE1 library to provide an entirely new API. Since its initial release in 2015, there has been further development of the code and it now differs from PCRE1 in more than just the API. PCRE2 is written in C, and it has its own API. There are three sets of functions, one for the 8-bit library, which processes strings of bytes, one for the 16-bit library, which processes strings of 16-bit values, and one for the 32-bit library, which processes strings of 32-bit values. Unlike PCRE1, there are no C++ wrappers.

Security Fix(es):

PCRE2 before 10.49, when there is an attacker-controlled regular expression and certain JIT API usage, allows an out-of-bounds write with arbitrary data.(CVE-2026-103111)
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
7.6 High
Timeline
Published16 Oct 2026
Updated16 Oct 2026
First seen16 Oct 2026
Sources
OESA-2026-4334 · OSV
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