CVE-2026-76886: wireshark foundation wireshark Heap-based Buffer Overflow
CVSS: 9.8v3.1CriticalAnalyzed
AliasesUBUNTU-CVE-2026-76886DEBIAN-CVE-2026-76886
Published 19-08-2026Last modified 20-08-2026
Vulnerability summary
CVE-2026-76886 is a critical (CVSS 9.8) Heap-based Buffer Overflow vulnerability in wireshark foundation wireshark. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.7% of scored vulnerabilities. 2 public exploits are recorded.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
0.38%
0%100%
Low · +0.06 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits2reference
Advisory lineage
Upstream 0 · Downstream 7 · Related 4Timeline
- 19-08-2026PublishedVulnerability first disclosed.
- 20-08-2026Last modifiedVulnerability information updated.
Description
C12.22 protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
CVSS metrics
4 scores · 4 sources · 1 versionCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSources4 sources · 8.1–9.8
- CVE.orgCNA8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.38%
Chance of exploitation in the next 30 days
Percentile
31%
Versus all other CVEs
30-day change
+0.06 pp
From 0.32% on 19-09-2026
19-09-202619-10-2026
EPSS score0.38%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundExploit Reference (gitlab.com)
Maturity: unknown
Exploit Reference (gitlab.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian1 product
- wiresharkAll versions (No fix recorded) | < 4.4.18-0+deb13u1 | < 4.6.9-1
Ubuntu1 product
- wiresharkAll versions (No fix recorded)
Wireshark1 product
- wireshark≥ 4.4.0, < 4.4.18 | ≥ 4.6.0, < 4.6.8
Wireshark foundation1 product
- wireshark≥ 4.6.0, < 4.6.8 | ≥ 4.4.0, < 4.4.18
4 vendors · 4 products
