CVE-2026-77014Network attack vector

Response integrity loss via truncated range sorting

Published Aug 20, 2026 · Updated Aug 25, 2026

Numeric truncation in libsoup SoupServer allows remote attackers to omit requested byte ranges from HTTP 206 responses. The sort_ranges() comparator subtracts 64-bit range offsets but returns a 32-bit int, reversing the ordering sign when offsets differ by more than INT_MAX. A reachable SoupServer must serve a resource larger than about 2 GB; successful requests receive incomplete partial content, affecting response integrity.

CVSS severity5.3
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Numeric truncation in libsoup SoupServer allows remote attackers to omit requested byte ranges from HTTP 206 responses. The sort_ranges() comparator subtracts 64-bit range offsets but returns a 32-bit int, reversing the ordering sign when offsets differ by more than INT_MAX. A reachable SoupServer must serve a resource larger than about 2 GB; successful requests receive incomplete partial content, affecting response integrity.

The record

CVE
CVE-2026-77014
Published
Aug 20, 2026
Updated
Aug 25, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 6
Classifications
CWE-197
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 6Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

5.3Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-197Numeric Truncation Error

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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