Event Monitor Cyber
EM-20261106-ADH0 VulnerabilityHigh severity

Regexp2 Vulnerability (CVE-2026-77299)

CVE-2026-77299

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Status
Developing

Since : signals keep joining.

First Signal
Nov 06 01:28 UTCC41 Red Hat Security Data
Page Born
Nov 06 02:17 UTCsecond source joined
Last Signal
Nov 06 02:17 UTC12 hours before snapshot
Sources
21 official · 1 research, news or crowd
Open For
11 hoursso far

Life Of This Page

  1. 1
    Born
    A second, independent source names it.
  2. 2
    Developing · Now
    New signals join; severity can move.
  3. 3
    Confirmed
    Not yet
    CISA KEV lists it, or exploitation in the wild is reported.
  4. 4
    Resolved
    Not yet
    Past the fix deadline and 14 days with no new signal.
  5. 5
    Archived
    Not yet
    30 days after resolved. Read only; the link keeps working. Reopens if it comes back.

The ID never changes, and earlier addresses keep working. A correction is logged, never overwritten. If two pages turn out to be one incident, the later one points to the earlier.

Vulnerability Lifecycle

  1. Disclosed: reached
    Nov 06 02:17 UTC
    C6 NVD published
  2. Scored: reached
    Nov 06 02:17 UTC
    CVSS 7.5
  3. Exploited: not yet
    Not yet
    No exploitation reported
  4. Advisories: not yet
    Not yet
    None yet
  5. Vendor Response: reached
    Nov 06 01:28 UTC
    C41 published
  6. Resolved: not yet
    Not yet
    After 14 quiet days

Timeline

20:0022:00Nov 602:0004:0006:0008:0010:0012:00BornC41 Red Hat Security DataC6 NVD CVE API 2.0

Point at a mark to read it. Squares are signals, colored by severity; every one is also listed under Signals.

Signals

  1. CVE-2026-77299 (CVSS 7.5) (opens source in a new tab) Regexp2 is a feature-rich RegExp engine for Go. Prior to version 2.3.0, when regexp2 compiles and matches a pattern containing a large fixed-count quantifier applied to a zero-width subexpression — e.g. (?:){50000000}… High severityDatabaseC6 NVD CVE API 2.0
  2. Red Hat: CVE-2026-77299 (important) (opens source in a new tab) github.com/dlclark/regexp2: regexp2: Denial of Service via unbounded memory allocation during pattern matching High severityVendorC41 Red Hat Security Data