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TI-2026-85273 Aliases CVE-2026-122146GHSA-3xf2-c6c2-98qc

Memory corruption in 101arrowz fflate unzipSync function

Priority HIGH 70CWE-119Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

fflate versions 0.8.0, 0.8.1, 0.8.2 and 0.8.3 contain a flaw in the unzipSync function in esm/index.mjs. An improper restriction of operations within the bounds of a memory buffer (CWE-119) causes memory corruption. A remote attacker without privileges or user interaction can trigger it. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

A weakness has been identified in 101arrowz fflate up to 0.8.3. This issue affects the function unzipSync of the file esm/index.mjs. This manipulation causes memory corruption. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00293 22nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
101arrowzfflate0.8.0; 0.8.1; 0.8.2; 0.8.3—No fix listedCNA
  • fflate Vendor101arrowz Affected 0.8.0; 0.8.1; 0.8.2; 0.8.3 Fixed in — No fix listed CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:101arrowz:fflate:*:*:*:*:*:*:*:*——101arrowz
  • cpe:2.3:a:101arrowz:fflate:*:*:*:*:*:*:*:* Versions — — ·101arrowz

Remediation

The sources list no fixed version for fflate.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Timeline

  1. 2026-11-05 Threatist record created from CVE-2026-122146
  2. 2026-11-05 Alias added: GHSA-3xf2-c6c2-98qc
  3. 2026-11-05 CISA SSVC decision points changed
  4. 2026-11-05 Priority changed: MEDIUM → HIGH

References

Exploit 1

  • TI-2026-33552 Uncontrolled resource consumption in 101arrowz fflate CVSS 4.0MEDIUM 6.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences