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    CVE-2006-2786

    HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 1.5.0.4, when used with certain proxy servers, allows remote attackers to cause Firefox to interpret certain responses as if they were responses from two different sites via (1) invalid HTTP response headers with spaces between the header name and the colon, which might not be ignored in some cases, or (2) HTTP 1.1 headers through an HTTP 1.0 proxy, which are ignored by the proxy but processed by the client.

    Published:Jun 1, 2006
    Last Modified:Apr 16, 2026
    EPS:Jun 2, 2006
    EPSS Score:0.02439
    CVSS Score:2.6

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-84144 (CVSS 7.5) — Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence…
    CVE-2026-84143 (CVSS 9.8) — Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of th…
    CVE-2026-84142 (CVSS 9.8) — Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or a…
    CVE-2026-84141 (CVSS 9.8) — Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 155, Firefox ESR…
    CVE-2026-84140 (CVSS 9.8) — Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ES…
    CVE-2026-84139 (CVSS 6.1) — Clickjacking issue in the DOM: Events component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.…
    CVE-2026-84138 (CVSS 6.5) — Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155 and Thunderbird 155…
    CVE-2026-84137 (CVSS 4.3) — Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 153…
    CVE-2026-84136 (CVSS 6.1) — Other issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, …
    CVE-2026-84135 (CVSS 9.8) — Other issue in Firefox Focus for Android. This vulnerability was fixed in Firefox 155.…

    References

    http://rhn.redhat.com/errata/RHSA-2006-0609.html
    http://secunia.com/advisories/20376
    http://secunia.com/advisories/20382
    http://secunia.com/advisories/20561
    http://secunia.com/advisories/20709
    http://secunia.com/advisories/21134
    http://secunia.com/advisories/21176
    http://secunia.com/advisories/21178
    http://secunia.com/advisories/21183
    http://secunia.com/advisories/21188
    http://secunia.com/advisories/21269
    http://secunia.com/advisories/21270
    http://secunia.com/advisories/21324
    http://secunia.com/advisories/21336
    http://secunia.com/advisories/21532
    http://secunia.com/advisories/21631
    http://secunia.com/advisories/22065
    http://secunia.com/advisories/22066
    http://securitytracker.com/id?1016202
    http://securitytracker.com/id?1016214
    http://www.debian.org/security/2006/dsa-1118
    http://www.debian.org/security/2006/dsa-1120
    http://www.debian.org/security/2006/dsa-1134
    http://www.gentoo.org/security/en/glsa/glsa-200606-12.xml
    http://www.gentoo.org/security/en/glsa/glsa-200606-21.xml
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:143
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:145
    http://www.mozilla.org/security/announce/2006/mfsa2006-33.html
    http://www.novell.com/linux/security/advisories/2006_35_mozilla.html
    http://www.redhat.com/support/errata/RHSA-2006-0578.html
    http://www.redhat.com/support/errata/RHSA-2006-0594.html
    http://www.redhat.com/support/errata/RHSA-2006-0610.html
    http://www.redhat.com/support/errata/RHSA-2006-0611.html
    http://www.securityfocus.com/archive/1/435795/100/0/threaded
    http://www.securityfocus.com/archive/1/446657/100/200/threaded
    http://www.securityfocus.com/archive/1/446658/100/200/threaded
    http://www.securityfocus.com/bid/18228
    http://www.vupen.com/english/advisories/2006/2106
    http://www.vupen.com/english/advisories/2006/3748
    http://www.vupen.com/english/advisories/2006/3749
    http://www.vupen.com/english/advisories/2008/0083
    https://exchange.xforce.ibmcloud.com/vulnerabilities/26844
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9966
    https://usn.ubuntu.com/296-1/
    https://usn.ubuntu.com/296-2/
    https://usn.ubuntu.com/297-1/
    https://usn.ubuntu.com/323-1/
    http://rhn.redhat.com/errata/RHSA-2006-0609.html
    http://secunia.com/advisories/20376
    http://secunia.com/advisories/20382
    http://secunia.com/advisories/20561
    http://secunia.com/advisories/20709
    http://secunia.com/advisories/21134
    http://secunia.com/advisories/21176
    http://secunia.com/advisories/21178
    http://secunia.com/advisories/21183
    http://secunia.com/advisories/21188
    http://secunia.com/advisories/21269
    http://secunia.com/advisories/21270
    http://secunia.com/advisories/21324
    http://secunia.com/advisories/21336
    http://secunia.com/advisories/21532
    http://secunia.com/advisories/21631
    http://secunia.com/advisories/22065
    http://secunia.com/advisories/22066
    http://securitytracker.com/id?1016202
    http://securitytracker.com/id?1016214
    http://www.debian.org/security/2006/dsa-1118
    http://www.debian.org/security/2006/dsa-1120
    http://www.debian.org/security/2006/dsa-1134
    http://www.gentoo.org/security/en/glsa/glsa-200606-12.xml
    http://www.gentoo.org/security/en/glsa/glsa-200606-21.xml
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:143
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:145
    http://www.mozilla.org/security/announce/2006/mfsa2006-33.html
    http://www.novell.com/linux/security/advisories/2006_35_mozilla.html
    http://www.redhat.com/support/errata/RHSA-2006-0578.html
    http://www.redhat.com/support/errata/RHSA-2006-0594.html
    http://www.redhat.com/support/errata/RHSA-2006-0610.html
    http://www.redhat.com/support/errata/RHSA-2006-0611.html
    http://www.securityfocus.com/archive/1/435795/100/0/threaded
    http://www.securityfocus.com/archive/1/446657/100/200/threaded
    http://www.securityfocus.com/archive/1/446658/100/200/threaded
    http://www.securityfocus.com/bid/18228
    http://www.vupen.com/english/advisories/2006/2106
    http://www.vupen.com/english/advisories/2006/3748
    http://www.vupen.com/english/advisories/2006/3749
    http://www.vupen.com/english/advisories/2008/0083
    https://exchange.xforce.ibmcloud.com/vulnerabilities/26844
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9966
    https://usn.ubuntu.com/296-1/
    https://usn.ubuntu.com/296-2/
    https://usn.ubuntu.com/297-1/
    https://usn.ubuntu.com/323-1/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High