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CVE-2019-20838 is an out-of-bounds read vulnerability in libpcre versions before 8.43. The flaw is in the JIT compilation path, specifically the compile_iterator_matchingpath() routine in pcre_jit_compile.c. It is triggered when UTF mode is disabled and a regular expression uses the \X or \R construct with a fixed quantifier greater than one. The erroneous JIT processing can read beyond the subject buffer.
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11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A PCRE JIT buffer over-read vulnerability triggered when UTF support is disabled and \X or \R uses a fixed quantifier greater than one. It affects installed PCRE packages on the Rocky Linux 8 host covered by CIQ advisory crlsa-2021_4373.
Included in this Migration Toolkit for Containers security-update advisory; no vulnerability details are provided in the content.
Included in the advisory's CVE list; no vulnerability details are provided.
Unknown
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.