CVE-2015-8386

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 7%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

PCRE before 8.38 mishandles the interaction of lookbehind assertions and mutually recursive subpatterns, which allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact via a crafted regular expression, as demonstrated by a JavaScript RegExp object encountered by Konqueror.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation7% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
7%
EPSS %ILE
94%
KEV
Not listed

Published

December 2, 2015

Last Modified

May 6, 2026

Advisory Details (5)

Auto-updated Sep 16, 2026
Patch available. Sources: redhat.
redhat Patch Available
https://access.redhat.com/errata/RHSA-2016:1132
generic

CVE-2015-8394 - PSIRT.COM

http://www.securityfocus.com/bid/82990
generic

oss-security - Re: Heap Overflow in PCRE

http://www.openwall.com/lists/oss-security/2015/11/29/1
generic
http://rhn.redhat.com/errata/RHSA-2016-2750.html
generic
http://rhn.redhat.com/errata/RHSA-2016-1025.html

Vendor Advisories for CVE-2015-8386(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibpcre3 (2:8.35-7.1ubuntu1.3) @ wily2026-05-20ubuntu
redhatrh-php56-php-pear-1:1.9.5-4.el72016-11-15redhat
redhatrh-mariadb100-mariadb-1:10.0.25-4.el72016-05-26redhat
redhatpcre-0:8.32-15.el7_2.12016-05-11redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 2 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
pcre3—2:8.38-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
pcre3—2:8.38-1—

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 5× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 157 total refreshes for this CVE.

  1. 2026-09-18 19:22 UTCEPSS rescore
  2. 2026-09-17 19:21 UTCEPSS rescore
  3. 2026-09-15 05:01 UTCOSV refresh
  4. 2026-09-15 03:05 UTCEPSS rescore
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  14. 2026-08-27 14:20 UTCEPSS rescore
  15. 2026-08-27 04:34 UTCOSV refresh
  16. 2026-08-26 14:41 UTCEPSS rescore
  17. 2026-08-25 13:44 UTCEPSS rescore
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  1. 2026-08-12 13:46 UTCEPSS rescore
  2. 2026-08-11 13:36 UTCEPSS rescore
  3. 2026-08-10 18:08 UTCOSV refresh
  4. 2026-08-09 13:42 UTCEPSS rescore
  5. 2026-08-08 16:32 UTCEPSS rescore
  6. 2026-08-07 16:22 UTCEPSS rescore
  7. 2026-08-06 13:42 UTCEPSS rescore
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  15. 2026-07-26 14:50 UTCEPSS rescore
  16. 2026-07-25 18:01 UTCOSV refresh
  17. 2026-07-25 14:13 UTCEPSS rescore
  18. 2026-07-24 14:13 UTCEPSS rescore
  19. 2026-07-23 14:14 UTCEPSS rescore
  20. 2026-07-23 01:20 UTCEG score recompute
  21. 2026-07-23 00:21 UTCEG score recompute
  22. 2026-07-22 21:59 UTCEG score recompute
  23. 2026-07-22 14:04 UTCEPSS rescore
  24. 2026-07-21 15:21 UTCEPSS rescore
  25. 2026-07-21 15:21 UTCEPSS rescore
  26. 2026-07-20 17:03 UTCEPSS rescore
  27. 2026-07-19 14:27 UTCEPSS rescore
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  40. 2026-07-09 19:05 UTCEPSS rescore
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  42. 2026-07-08 15:10 UTCEPSS rescore
  43. 2026-07-08 12:45 UTCOSV refresh
  44. 2026-07-07 13:42 UTCEPSS rescore
  45. 2026-07-07 13:42 UTCEPSS rescore
  46. 2026-07-06 16:24 UTCEPSS rescore
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  49. 2026-07-04 06:28 UTCEPSS rescore
  50. 2026-07-01 15:02 UTCEPSS rescore
  51. 2026-06-30 23:19 UTCEPSS rescore
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  53. 2026-06-29 14:03 UTCEPSS rescore
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  64. 2026-06-21 14:54 UTCEPSS rescore
  65. 2026-06-20 00:19 UTCOSV refresh
  66. 2026-06-19 19:23 UTCEPSS rescore
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  68. 2026-06-18 17:50 UTCEPSS rescore
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  74. 2026-06-14 23:14 UTCEPSS rescore
  75. 2026-06-13 22:57 UTCEPSS rescore

Frequently asked(5)

What is CVE-2015-8386?
CVE-2015-8386 is a critical vulnerability published on December 2, 2015. PCRE before 8.38 mishandles the interaction of lookbehind assertions and mutually recursive subpatterns, which allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact via a crafted regular expression, as demonstrated by a JavaScript RegExp…
When was CVE-2015-8386 disclosed?
CVE-2015-8386 was first published in the National Vulnerability Database on December 2, 2015, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-8386 actively exploited?
CVE-2015-8386 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7% probability of exploitation in the next 30 days, which ranks it in the top 6.1% of all scored CVEs.
What is the CVSS score of CVE-2015-8386?
CVE-2015-8386 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2015-8386?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-8386, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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